go off (Oxford Wordpower)

Oxford Wordpower:

Animals fall into two groups, those with backbones and those without.
動物分兩類, 有脊椎與無脊椎.

John looks exactly like his father.
阿莊兩父子面貎酷肖, 十足十一個餅印.

You'll have to go in single file---the path is very narrow.
路太窄, 要一個跟一個排住隊行.

If the fire alarm goes off, leave the building immediately.
｢爆𧬰｣