by means of通过….., 靠……

　　by this means/ in this way用这种方法

　　by no means/in no case决不

　　by all means用一切办法

　　♣keep常用短语

　　keep up with紧跟…..

　　keep sb. doing sth.让某人一直做

　　keep sb. from doing sth.阻止…..做……

　　keep off the grass勿踏草地

　　keep to the point紧扣主题

　　keep in touch with与……保持联系