1、确保：Assure, ensure, guarantee, pledge 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，jumpto，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，bestable，maintain the same level，remain unchanged，be still，remain the samelevel，stay constant，keep at the same level，level off，stabilize，keep itsstability，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，bycomparison with，by comparison to