1.rigid/stiff/unchanged/littlechange僵硬的，一成不变的
2.significant/enormous/dramatic/tremendous/appreciably/remarkable/crucial/巨大的,明显的，程度大的/substantial
3.approximately将近nearly,almost
4.proportion/percentage比例
5.beinvolved(in)/involvein/involvement[n.]涉及，卷入，参与
6.given/considering,inregardto/despite/although有鉴于,考虑到，尽管
6.induce[v]引入，引导，引诱/inductive[n]归纳（deduce/deductive推断）
7.fortune/destiny/chances
8.deplete开采完，耗尽/exhaustexhaustemission(尾气)排放/exploit
9.complex错综复杂的/complicated/sophisticated老奸巨滑的，复杂的
10.capacity能力，容量/competence（竞争）能力/ability能力（笼统的）
11.确保，保障：Secure-security/ensure(insure)/guarantee押金
12.solely/merely/only
13.avastarrayof系列/agreatvarietyof花样，品种/agreatrang系列of
14.pesticide杀虫/suicide自杀/homicide/murder杀人
15.believe/assume(responsibility)/suppose
16.授权，委托：authorize/commission佣金/entitle头衔+ment=right（权利）
17.purchase/buy
18.ethnic种族的/ethic伦理，道德的+s=[n.]
19.modify/change[v]shiftwork轮班工作[n]
20.insight/knowledge/learning/understanding/knowing