Studying on drop temperature effect, add humidity effect, balance of carbon and oxygen effect, absorbing dirt effect, killing germ effect, decreasing noise effect and air anion effect.

分析了绿地系统的降温效应、增湿效应，碳氧平衡效应，吸尘、杀菌、减噪效应和空气负离子效应。

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Venturi tube is one of key equipments in process of purification and recovery of converter gas, which is used to drop temperature of converter gas with spraying jet fixed at throat of Venturi tube.

文氏管内部的流动与传热较为复杂，不仅涉及喷淋液滴与烟气在流动过程中的相互作用，而且涉及喷淋液滴遇到高温烟气发生相变进行的传热传质。

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If temperatures overnight are already very close to the freezing point, then this drop of just a few degrees can take the temperature below freezing.

如果夜间的温度已经非常接近冰点，那么仅仅下降几度就可以使温度降到冰点以下。

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Experts say heat waves often become dangerous when the nighttime temperature does not drop much from the highest daytime temperature.

VOA: special.2010.07.27

So I've got, this piston here is compressed, and I slowly, slowly increase the volume, drop the temperature.

这样，这个活塞就被压缩了，然后我再很慢很慢地增加它的体积，降低温度。

麻省理工公开课 - 热力学与动力学课程节选

The evaporation process creates a drop in temperature of several degrees.

VOA: special.2009.02.09

In fact, they say, the sudden drop in temperature can be dangerous for people with underlying health issues.

CNN: Are polar bear plunges good for you?

Roddick has only ever beaten Federer in two of their previous 17 meetings -- the most recent success coming in Miami last year -- and he never looked like repeating that in a match played with the Rod Laver Arena roof open following a drop in temperature which brought to an end the extreme heat policy procedures.

CNN: Superb Federer crushes Roddick in semis

The children were so weak they couldn't cope when a tiny drop in the temperature came after sunset.

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