line
1.a line和a few lines都可以用作“短信”解。例如：Please drop me a line（或a few lines）as soon as possible. a few lines相当于“惠我数行”里的“数行”。信的开首有Just a line to tell you that...或A line to say that...等惯用语。例如：Just a line to tell you that I have passed the examination. 但虽然用了line，那信也许是很长的。
2.along these lines（关于这件事）是商业信函里的陈套语。在一般通信里该避免。
