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back and forth来回地,反复地
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
by reason of由于
by the way顺便说说
by virtue of借助,由于
by way of经由,通过...方法
due to由于,因为
each other互相
even if/though即使,虽然
ever so非常,极其
every now and then时而,偶尔
every other每隔一个的
except for除了...外