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If they are not brought to the surface soon they may lose their lives.
may这里是表示推测，类似可表推测的情态动词还有：can/could, must
她的男朋友是他！怎么可能呢？！
Her boyfriend is that guy! How could it be possible ?
肯定那家伙追了她很久很久……
He must have been courting her for a very long time…
我好像在哪见过他。I may have met him somewhere.
If they are not brought to the surface soon they may lose their lives.
当情态动词表推测时：
can（could）不肯，may（might）不问，must肯定不否问。
rescue 营救
营救人员冲向飞机坠毁的现场。
The rescue workers rushed to the site of the plane crash.
如果没人跳下水救她，她很快就会被淹死。
If no one dives to rescue her, she will soon be drowned to death.
to 是介词
烧死 be burned to death 饿死 be starved to death
