When cooking or baking, check periodically to make sure nothing is burning, and set a timer to ring when the food will be done.

在烹饪或烘烤时，定时检查以确保没有东西烧焦，设置记时器以在食物要好时进行提醒。

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Note the return check from del_timer, which identifies whether the timer is still in use.

注意来自 del_timer 的返回检查，它确定计时器是否还在使用。

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As with other automatic deliveries this can be done on a per-check-in or timer basis.

跟其他自动化交付方式一样，可以采取签入时方式或定时方式。

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