1.have trouble with:与……有纠纷，有……的病痛
例句：I'm still having trouble with this math problem.我依然为这道数学题目而苦恼。
2.stop off:中途停留
例句：We stopped off at a hotel for the night.我们中途停下来在一家旅馆住了一宿。
常用口语：How old are you? Could I speak to someone?
