4. It never rains but it pours.指不吉利的事，不发生则已，一发生就接二连三地发生；
如：I lost my check book, tore my jacket, and trapped my finger in a door all in one day—it never rains but it pours.我这一天，支票本丢了，上衣也撕破了，还让门把手指夹了——哎，真是祸不单行啊。
