20秒记一个单词（第1991个）collapsecollapse /k??l?ps/ v. (忽然)坍毁,坍塌点击收听音频跟读 ↓↓↓ ↓↓↓ ↓↓↓例句/词组:The roof collapsed under the weight of snow. 房顶在雪的重压下...