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每周一聽——那些年我們一起練過的聽力(第51期) 已有55人參與
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[ Last edited by 求知者001 on 2013-3-2 at 13:11 ] |

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感謝大家支持,上期活動鏈接:http://www.gaoyang168.com/bbs/viewthread.php?tid=5529056&fpage=1 上期活動講解 詞匯講解: 1. lack vt. 缺乏; 缺少 例句:I lack words with which to express my thanks. 我無法以言語來表達(dá)我的感激之情。 2. either adv. (否定句中)也 例句:The product is of high quality and is not expensive either. 這種產(chǎn)品質(zhì)量好價格也不貴。 3. undesirable adj. 令人不快的,不受歡迎的;討厭的 例句:Big cuts in education are very undesirable. 教育經(jīng)費(fèi)的大幅度削減是極不受歡迎的。 4. outweigh vt. 在重要性或價值方面超過 例句:Her need to save money outweighs her desire to spend it on fun. 她省錢的需要比她花錢娛樂的愿望更重要。 5. survive vi. 幸存, 活下來 例句:These plants cannot survive in very cold conditions. 這些植物在嚴(yán)寒中不能存活。 6. eradicate vt. 摧毀,完全根除,消滅,杜絕 例句:The disease has been eradicated from the world. 這種疾病已在全世界得到根除。 7. dense adj. 密集的, 稠密的, 濃密的 例句:We entered a dense forest. 我們進(jìn)入一片濃密的森林。 8. transport vt. 運(yùn)送; 流放 例句:A bus transported us from the airport to the city. 一輛公共汽車把我們從飛機(jī)場送到城里。 9. bury vt. 掩埋, 埋藏 例句:The old man is burying his money. 老頭正在埋藏他的錢。 10. graze v. (讓動物)吃草; 牛、羊等(在草地上)吃青草 例句:The cattle are grazing in the field. 牛群在田野上吃草。 短語講解: 1. Weeds compete with plantings for water and nutrients. compete with與…抗?fàn)?br /> 例句:It is difficult for a small grocery store to compete with a supermarket. 小商店很難與超市抗?fàn)帯?br /> 2. A crop plant generally produces several hundred seeds. But a weed plant can produce tens or even hundreds of thousands of seeds. hundreds of thousands of 幾十萬,無數(shù),成千上萬的 例句:The city subway carries hundreds of thousands of passenger a day. 市內(nèi)的地下鐵每天運(yùn)載數(shù)十萬乘客。 3. Eradicating weeds means that you have to remove all the seeds and roots so the plants will not grow back. grow back重新長出 例句:All her hair was burned off in the fire, but the doctors have promised that it will soon grow back. 她的頭發(fā)在大火中燒掉了, 但醫(yī)生保證她的頭發(fā)還會長起來的。 4. A more common way to deal with weeds is to control them enough so that the land can be used for planting. deal with應(yīng)付, 處理; 對待 例句:There are many difficulties to be dealt with when starting a new business. 開展一項(xiàng)新業(yè)務(wù)時, 有許多困難需要解決。 be used for用來做… 例句:Wood is used for making paper. 木材用于造紙。 5. He says a dense, competitive crop that quickly shades the soil from the sun will help reduce weed growth. shade from擋, 遮(光或熱) 例句:She raised her hand to shade her eyes from the sun. 她抬起手遮住眼睛上方以擋住陽光。 6. Other controls include turning over the soil, pulling the weeds or covering them with mulch made of wood, garden waste or other material. turn over (使)翻轉(zhuǎn); 調(diào)轉(zhuǎn) 例句:The soil must be thoroughly turned over before planting. 一定要先把土地深翻一遍再下種。 cover with用…遮蓋住, 用…填滿 例句:The field is covered with snow. 田野一片積雪。 7. But even mulch has its limits. Natural resource specialists point out that weeds can be transported in mulch. point out指出 例句:He pointed out that there was little chance of success. 他指出很少有成功的機(jī)會。 8. Insects and other organisms can also act as biological controls. act as擔(dān)當(dāng)…; 起…的作用 例句:An oar often acts as rudder. 槳?善鸲娴淖饔。 9. Farm vehicles should be kept out of areas with weeds. keep out (使)留在外面 例句:They shut the door and meant to keep us out. 他們關(guān)上門, 存心不讓我們進(jìn)去。 When is a plant considered a weed? Experts at Penn State University have a simple answer: When the undesirable qualities outweigh the good qualities. 植物在什么時候被當(dāng)做雜草?賓夕法尼亞州立大學(xué)的專家們給了簡單的答案,那就是當(dāng)不合意的品質(zhì)大于良好品質(zhì)時。 Consider the fact that crops generally produce several hundred seeds from each plant. By comparison, each weed plant can produce tens or even hundreds of thousands of seeds. And some buried seeds can survive up to forty years -- or even longer. 通常情況下,農(nóng)作物每株會生產(chǎn)幾百粒種子。但是每株野草會生產(chǎn)幾萬甚至幾十萬粒種子。有一些深埋的種子可以存活四十年甚至更長時間。 Eradicating weeds means that you have to remove all the seeds and roots so the plants will not grow back. But birds or the wind can reintroduce them to the land. 根除野草意味著必須除掉所有的種子,并且將植株連根拔起,以免其重生。但是鳥或風(fēng)會將種子重新帶回土地。 A more common way to deal with weeds is to control them enough so that the land can be used for planting. Experts advise using two or more control methods to deal with weeds. 處理野草更加普遍的方法是對其加以中分的控制,使土地可以耕種。專家建議使用兩種或者更多方法來處理野草。 Chemical weed killers or natural treatments like corn gluten can suppress weed growth. Dense planting of a crop can also act as a natural control. 化學(xué)殺蟲劑或玉米黃粉等自然方法可抑制雜草生長,將作物種稠密些也可自然控制雜草。 Bill Curran is a professor of weed science at Penn State, in University Park, Pennsylvania. He says one of the most common methods for suppressing weeds is dense planting. Bill Curran是賓夕法尼亞州立大學(xué)大學(xué)城分校教授,他說最常見的控制雜草的辦法是密植。 He says a dense, competitive crop that quickly shades the soil will help suppress many weeds. The seeds need light to grow, so blocking the sun will reduce weed growth. 他說,稠密、競爭性強(qiáng)的作物可以快速遮蓋土壤并抑制多種雜草,種子生長需要陽光,所以封鎖陽光就阻止雜草的生長。 Other controls include turning over the soil, pulling the weeds or covering them with mulch made of shredded wood, garden waste or other material. 其他控制方法包括翻土,用手拔草或者用木質(zhì)地膜,花園廢棄物或其他材料進(jìn)行覆蓋。 But even mulch has its limits. Natural resource specialists point out that weeds can be transported in mulch. This is also true of soil, grain, hay and animals. 但是覆蓋物也有其局限性。自然資源專家指出,雜草可以通過地膜進(jìn)行傳播。也可以通過土壤,谷物,干草和動物進(jìn)行傳播。 Yet animals like sheep or goats eat weeds, so they can provide a biological control. Insects and other organisms can also act as biological controls. 然而,動物,比如綿羊或山羊可以起到生物控制的作用——他們會吃掉雜草。昆蟲和其他有機(jī)體都可以起到生物控制的作用。 Preventing the spread of weeds is an important part of weed management. Farm vehicles should be kept out of areas with weeds. If that is not possible, then clean off the equipment and your shoes when leaving. 控制雜草的傳播是雜草管理的重要部分。農(nóng)田機(jī)器應(yīng)該遠(yuǎn)離長滿雜草的地方。如果不可能的話,離開的時候要清潔機(jī)器和鞋子。 Some people burn weeds or bury them deeply or make them into mulch. 一些人將雜草和花園廢棄物帶到垃圾中心或者燃燒,深埋或?qū)⑺麄兘g碎。 Professor Curran says another way to make use of weeds is to compost them. Heat is produced in the process of making organically rich compost to improve soil. The heat will kill many, though not all, weed seeds. The same is true for seeds that pass through animals that graze on weeds. Curran教授說,用雜草制作堆制肥料是對雜草加以利用的好方法。制作有機(jī)堆肥的過程會產(chǎn)生熱量。熱量會殺死許多雜草種子。農(nóng)田生物拒絕雜草的過程道理也是一樣的。 |


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