核心单词
1. caution n.小心,谨慎;警告,告诫; vt.警告,告诫,使小心 常用结构: with caution 小心地 treat sth. with caution 认真对待某事物 caution+that-clause 警告…… caution sb. against sth. 警告某人不要做某事,要某人谨防某事 caution sb. not to do sth. =caution sb. against doing sth. 警告某人不要做某事