2、 有害的： Bad, baneful evil, harmful, detrimental

　　3、要求 ：Request, demand, needs, requisition

　　4、消除 ：Eliminate, clear, remove, clear up, take away, smooth away

　　5、 导致： Lead to, bring about, result in, cause, spark off, conduce to, procure, induce, generate

　　6、 因此：So, therefore, thus, hence, consequently, as a consequence, accordingly, as a result, because of this, as a result of this

　　7、 增长至：Grow to，rise to，increase to，go up to，climb to，ascend to，jump to，shoot to

　　8、降低至：Dip to，fall to，decline to，decrease to，drop to，go down to，reduce to， slump to，descend to，sink to，slide to

　　9、保持稳定：Level out，do not change，remain stable，remain still，remain steady，be stable，maintain the same level，remain unchanged，be still，remain the same level，stay constant，keep at the same level，level off，stabilize，keep its stability，even out

　　10、急剧地：Dramatically，drastically，sharply，hugely，enormously，steeply，substantially，considerably，significantly，markedly，surprisingly，strikingly，radically，remarkably，vastly，noticeably

　　11、平稳地：Steadily，smoothly，slightly，slowly，marginally，gradually，moderately，mildly

　　12、 宣称：Allege, assert, declare, claim

　　13、 发生：Happen, occur, take place

　　14、原因：Reason, factor, cause

　　15、发展：Development, advance, progress

　　16、有益的：Useful, helpful, beneficial, profitable, rewarding， advantageous

　　17、影响：Influence, impact, effect

　　18、明显的：Clear, obvious, evident, self-evident, manifest, apparent, crystal-clear

　　19、占：Comprise, take up, account for, constitute, consist of, make up, occupy, hold, compose

　　20、与…相比：Compared with，compared to，in comparison with，in comparison to，by comparison with，by comparison to