If you can't get a cab, give me a call. It's not safe to walk home along at night.
如果你叫不到出租车的话,打电话给我,晚上一人走回家不安全。
At this, the police pointed out ironically that this would hardly be necessary as the men were already under arrest.
警察听后讥讽地说,这大可不必,因为他俩已被逮捕了。