求助個(gè)Than前后一致的問(wèn)題
近來(lái)寫(xiě)文章被這個(gè)搞暈了，than前后比較的東西應(yīng)該是對(duì)等的，但看文獻(xiàn)里面有一些than后面用了does，有一些沒(méi)有，誰(shuí)能給我講解一下，謝謝了。投文章審稿人說(shuō)我的英語(yǔ)需要找人潤(rùn)色一下。
下面是文獻(xiàn)里面摘的一些例句：
These catalysts exhibit increased thermal stability and produce higher molecular weight polymers than conventional metallocene catalysts
18-ZrCl/MAO produces polyethylene with a higher molecular weight than 18-ZrMe/B2
ethylene-bridged catalyst 19-ZrMe is more active than methylene-bridged catalyst 18-ZrMe
18-TiMe/B2 and 19-TiMe/B2 exhibit∼65X and∼35X greater polymerization activity, respectively, than does the monometallic catalyst 20-TiMe/B1
catalyst 19-TiMe enchains 15.4% more styrene than does 20-TiMe/B1.
calculated reactivity ratios indicate that binuclear catalyst 19-TiMe/B2 favors styrene insertion more than does catalyst 20-TiMe/B1
Single-component Ni(II) catalyst 33 (Chart 17),86 based on a 3,30-bisalicylaldimine ligand, yields polyethylene with lower activity than the mononuclear Ni(II) Grubbs’ catalyst
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These catalysts exhibit increased thermal stability and produce higher molecular weight polymers than conventional metallocene catalysts（后面跟的句子結(jié)構(gòu) “exhibit。。。。。�！币�?yàn)橹貜?fù)省略）
18-ZrCl/MAO produces polyethylene with a higher molecular weight than 18-ZrMe/B2 (后面跟的句子結(jié)構(gòu) “produces ......同上，省略）
ethylene-bridged catalyst 19-ZrMe is more active than methylene-bridged catalyst 18-ZrMe 后面跟的句子結(jié)構(gòu) “is..........."同上，省略）
18-TiMe/B2 and 19-TiMe/B2 exhibit∼65X and∼35X greater polymerization activity, respectively, than does the monometallic catalyst 20-TiMe/B1 (does 代表前面的 “exhibit”，省略后句子結(jié)構(gòu)倒裝）
catalyst 19-TiMe enchains 15.4% more styrene than does 20-TiMe/B1. (does 代表前面的 “enchains”，省略后句子結(jié)構(gòu)倒裝）
calculated reactivity ratios indicate that binuclear catalyst 19-TiMe/B2 favors styrene insertion more than does catalyst 20-TiMe/B1 (does 代表 “favors”，省略后句子結(jié)構(gòu)倒裝）
Single-component Ni(II) catalyst 33 (Chart 17),86 based on a 3,30-bisalicylaldimine ligand, yields polyethylene with lower activity than the mononuclear Ni(II) Grubbs’ catalyst （后面跟的句子結(jié)構(gòu) “yields。。。。。�！币�?yàn)橹貜?fù)省略），
啊，我的問(wèn)題是為什么有的省略了，有的加了個(gè)does，does不可以省略嗎？
可以省，可以省，取決于作者認(rèn)為后面的省略是否清晰，但其實(shí)省不省都一樣。只要主語(yǔ)有同質(zhì)性可比性都可以省