be certain of/about 确信某事

be comparable to/with 可比较的，类似的

be composed of 由……组成

be concerned with/about 担心

be consistent with 一致

by accident 偶然

by analogy 用类推的方法

back and forth 来回地，反复地

behind one's back 背者某人，暗中

behind bars 在狱中

beyond belief 难以置信

bit by bit 一点一点地

by the book 按规定，依照惯例

by and by 不久，迟早

by and large 大体上，总的来说

by the way 顺便提一句

by chance 偶然，碰巧

by any chance 万一，也许

beyond/without compare 无与伦比

by/in comparison 相比之下

by common consequence 经一致同意

by/in contrast 对比之下

by degree 渐渐地，逐渐地

beyond (a) doubt 无疑地，确实地

by hand 用手

by heart 凭记性，牢记

by itself 自动地，独自地

by and large 大体上，总的来说

by/in leaps and bounds 极其迅速地

by all means 当然可以

by on means 决不

beyond measure 不可估量

by mistake 错误地

by oneself 独自地，单独

beside the point 不相关的

by post 邮寄