摘要：
backof在...后面beforelong不久以后besidepoint离题的,不相干的beyondquestion毫无疑问byair通过航空途径byallmeans尽一切办法,... back of 在...后面
before long 不久以后
beside point 离题的,不相干的
beyond question 毫无疑问
by air 通过航空途径
by all means 尽一切办法,务必
by and by 不久,迟早
by chance 偶然,碰巧
by far 最,...得多
by hand 用手,用体力
by itself 自动地,独自地
by means of 用,依靠
by mistake 错误地,无意地
by no means 决不,并没有
by oneself 单独地,独自地
