He heard the alarm go off.
他听见警报响了。
The alarm did go off but all I did was yawn, turn over and go back to sleep.
闹钟确实响了，但我只是打了个哈欠，翻个身又接着睡着了。
Boys at that age should be able to explore and go off on their own, go on bike rides, get into mischief
那个年龄的男孩应该可以自己出去闯，也可以骑车出游，还可以调皮捣蛋。
He had never been afraid of failure: he was a gambler, ready to go off somewhere else and start all over again.
他从来都不害怕失败：他是个冒险家，随时准备到别处从头再来。
He pulled the trigger but the gun didn't go off.
他打了一枪，没有发火。