她的父母说它们也不知道，于是去看那个温度调节计。
They said they didn't know and they went to the thermostat to see.
使用反馈来调节系统的一个更为普遍的例子是供暖系统中的温度计。
A more familiar example of the use of feedback to regulate a system is the common thermostat for heating a room.
当发酵液接近20升的时候，要用灭过菌的温度计对温度进行测量，之后通过添加热或者冷果汁或者无菌水来调节温度。
Test with your sanitized dairy thermometer when you're up to 20 liters, and add hot or cold juice or water at the end to adjust the temperature.
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