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1.serve as 充当，作为，用作
例句：Or it can serve as the go-between for your personal and career schedules.
或者它也可以作为你个人和工作时间表的中间人。
2.warning sign 警告标志，预警信号
例句：Hearing things is a warning sign.
幻听到声音是个警示的预兆。
3.keep...under control ...处于控制之下，被控制住
例句：They now require much less water to keep them cool and under control, and produce less steam.
它们现在只需要较少量水的来保持冷却状态，产生的蒸汽也更少。
