by
by accident 偶然
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 ……得多;最多
by means of 用，凭借
by mistake 错误地，无意中(做错了某事)
by no means 决不，绝没有
by oneself 单独地，独自地
by the way 顺便地，附带说说
by way of 经过，经由;通过……的方法
learn by heart 记住，背诵
little by little 一点一点地，逐渐地
side by side 肩并肩地，一起