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