Winter closes in and the temperature drops below freezing.

冬天来临，气温降至冰点以下。

《柯林斯英汉双解大词典》

Wire the thermometers up to trigger off an alarm bell if the temperature drops.

把温度计的电线连接上，当温度下降时，就会触发警报。

《柯林斯英汉双解大词典》

If the temperature drops below zero degree, water will turn into ice.

如果气温降到零度以下，水就会结冰。

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If the temperature drops below a certain level it sends a signal, 'turn on the heat', and that signal stays on until it gets a negative signal to turn off.

如果温度降到一定程度以下时,探测器会发送一个信号,打开加热器,直到加热器再收到关闭的信号,它就会一直开着

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Or curl up with a hot water bottle as the temperature drops and listen to the whoop calls of hyena as you drift off to sleep.

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He notes that although a detectable tilt is caused when the temperature drops by a few degrees, that tilt is too small to explain the anomalies and, in any case, it would lag roughly 30 minutes behind the shadow (because it takes time for the ground to cool) while the experimental measurements show a change in g instantaneously during an eclipse.

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