n.底漆,启蒙读本,入门书
I borrowed from the library a primer of phonetics.
我从图书馆借了一本语音学入门书.
The bare metal was sprayed with several coats of primer.
裸露的金属上被喷上了几层底漆。
The President doesn't need a primer on national security.
总统对于国家安全是不需要读入门书的。