People put it in the oven all day in a heavy pot on a low heat.

人们一整天都把它放在炉上的一个很重的锅里，用小火加热。

youdao

The idea was that trapped greenhouse gases in the atmospheres of Earth and Mars might have caused temperatures to raise enough to compensate for the low heat the young Sun provided.

这个理论就是：在地球和火星的大气层里有足够的温室气体，来帮助提升温度，从而弥补了早期的太阳提供的较低的热量。

youdao

Melt the butter over a medium-low heat. When it is melted and bubbly, put in the flour.

用中低火把黄油加热。待黄油熔化起泡后，放入面粉。

《柯林斯英汉双解大词典》

The walls were built extra thick to save heat and energy-efficient appliances kept energy use low.

VOA: special.2009.10.27

Cover and cook over medium-low heat for 15 minutes, stirring from time to time, until the pear pieces are softened.

NPR: Perfect Pear Tartlets

He believes he has developed a system to capture CO2 from the atmosphere at low heat and potentially at low cost.

NEWYORKER: The Climate Fixers

Return pan to low heat and cook until vegetables are soft, about 5 minutes, stirring constantly and scraping the pan bottom well.

NPR: The Comforts of Food