If the air in the room is too dry, buy a humidifier.

如果室内空气太干燥，也可以用点加湿器。

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This can be in lieu of having to buy a humidifier and leaving it running.

这样可以代替不必买个加湿器而且让它不停地开着。

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Another was using a humidifier for a child who was allergic to dust mites;

另一种常见错误就是为对尘螨过敏的孩子购买加湿器；

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There would also be an inflatable ring around the baby, allowing it to feel more secure and to mimic the conditions in the womb, and a humidifier would pump warm air around inside.

BBC: Baby in an incubator

If you get within a certain number of miles from home, your oven might start heating up, or your humidifier would switch on.

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