热源的英文：
heat reservoir
source of heat
heater
heat producer
thermal resource
thermal source
radiant
heat source

参考例句：

It created a glowing centre of warmth that quickly diffused through my limbs.
它形成了一个温暖的热源，热量迅速扩散至我的四肢。

heat是什么意思：
n. 热；强烈的感情
v. 使变热或变暖；使激动

incomplete heat
不完全发情

heating installation
暖气设备|供暖装置

at a white heat
在盛怒之下|在感情万分激动之下

reservoir是什么意思：
n. 水库；蓄水池；储藏

A wick connects it to a reservoir.
一灯芯绳把它与水槽相连。

Big lazy to find a bear reservoirs, buy fish fry into the reservoirs.
大懒熊找了个水塘，买回鱼苗放进水塘。

Enterprise must have a reservoir of cheap labor.
企业应储备廉价的劳动力。

source是什么意思：
n. 来源，出处；原始资料；原因；发源地

They are trying to trace the source of the trouble.
他们正设法找出这件麻烦事的起因。

Where is the source of the Nile?
尼罗河发源于何处？

Is the water polluted at source?
河水是在源头受到污染的吗？