降温的英文：
drop in temperature
cool down
lower the temperature

参考例句：

Affected by strong cold air , Yantai experienced a big drop of temperature on Sunday.
当日，受强冷空气影响，山东省烟台市大幅降温。

Affected by strong cold air, Yantai experienced a big drop of temperature on Sunday.
当日，受强冷空气影响，山东省烟台市大幅降温。

The thermostat provides heating-cooling for year-round use.
这个温度控制器可适用全年运行的采暖降温控制。

The thermostat provides heating-cooling control for year-round use.
这个温度控制器可适用于全年运行的采暖-降温控制。

Insistence upon rules of conduct marks the ebb of religious fervor(Alfred North Whitehead)
坚持行为准则标志着宗教狂热的降温(艾尔弗雷德·诺思·怀特海德)

She cooled her child's fevered brow.
她给孩子滚烫的额头降温。

A cool down after finishing is important.
赛完后即刻降温是非常重要的。

Cool down very gradually after working up a sweat.
大量出汗后要慢慢降温。

Third, the real estate market in the doldrums, consumer hot spot cooling.
三是房地产市场低迷，消费热点降温。

Clearly, the world's second-biggest economy is cooling.
显然，世界第二大经济体正在降温。

drop是什么意思：
v. 落下；降低；垂下；停止；终止；放弃；与…断绝联系
n. 落差；球状糖果；珠，滴；少量

A small amount of liquid;a drop.
少量液体；一滴

low-velocity drop
低速度空投

high velocity drop
高速度空投

temperature是什么意思：
n. 温度，气温；高烧，发烧，发热；体温

The temperature climbed.
温度慢慢上升。

stack temperature
锅炉炉身温度

The capacitor surface temperature will not exceed the upper rated temperature.
电容器表面温度不许超过额定上限温度。

cool是什么意思：
n. 凉爽
adj. 凉快的；冷静的；冷漠的；冷色的
adv. 冷静地
v. 使凉快；平息

Their love has cooled.
他们的爱情冷却了。

That jacket is so cool.
那个唱片套太酷了。

burner cooling system
[烧毛机]火口冷却装置