1 by all means无论如何，必定

　　2 by chance偶然，意外地

　　3 by choice处于选择

　　4 by contrast 对比之下;

　　5 by means of 用，依靠; 借助于

　　6 by means of借助于

　　7 by mistake错误地

　　8 by the way顺便提一下

　　9 by virtue of 凭借，借助;因为，

　　10 by way of经由，通过…方式