at present 目前；現(xiàn)在

at sb's disposal 任……處理

at the cost of 以……為代價(jià)

at the mercy of 任憑……擺布

at the moment 此刻；目前

at this rate 照此速度

at times 有時(shí)；間或

back and forth 來(lái)回地；反復(fù)地

back of 在……后面

before long 不久以后

beside point 離題的，不相干的

beyond question 毫無(wú)疑問(wèn)

by air 通過(guò)航空途徑

by all means 盡一切辦法，務(wù)必

by and by 不久，遲早

by chance 偶然，碰巧

by far 最……得多

by hand 用手，用體力

by itself 自動(dòng)地,獨(dú)自地

by means of 用，依靠

by mistake 錯(cuò)誤地；無(wú)意地

by no means 決不；并沒(méi)有

by oneself 單獨(dú)地；獨(dú)自地

by reason of 由于

by the way 順便說(shuō)說(shuō)

by virtue of 借助，由于