21．平穩(wěn)地：Steadily, smoothly, slightly, slowly, marginally, gradually, moderately, mildly

　　22．宣稱(chēng)：Allege, assert, declare, claim

　　23．發(fā)生：Happen, occur, take place

　　24．原因：Reason, factor, cause

　　25．發(fā)展：Development, advance, progress

　　26．有益的：Useful, helpful, beneficial, profitable, rewarding, advantageous

　　27．影響：Influence, impact, effect

　　28．明顯的：Clear, obvious, evident, self-evident, manifest, apparent, crystal-clear

　　29．占：Comprise, take up, account for, constitute, consist of, make up, occupy, hold, compose

　　30．與…相比：Compared with, compared to, in comparison with, in comparison to, by comparison with, by comparison to

　　31．對(duì)比而言：By contrast, in contrast, on the other hand, on the contrary=, conversely

　　32．展示：Show, reveal, illustrate, demonstrate, depict, present, represent, describe

　　33．大約：Approximately, almost, about, around, nearly, roughly

　　34．波動(dòng)：Fluctuate, go ups and downs, display a fluctuation, demonstrate a fluctuation

　　35．事實(shí)上：Practically, in practice, essentially, in essence, in reality, in effect, in fact, as a matter of fact, it is a fact that

　　36．換言之：Namely, that is to say, in other words, to put it like this, to put it differently, to put it from another way, to put it from another angle

（來(lái)源：考試吧）