但是，纯洁的爱在性质上并不会猛烈地、无情地长久燃烧。

But it is not in the nature of pure love to burn so fiercely and unkindly long.

youdao

但是当他变得更胖后，他不能再以跑步来燃烧脂肪，这对他的膝盖造成了长久的损害。

But as he got fatter, he couldn't run and burn off the weight, and he permanently damaged his knees.

youdao

余火放进一个掏空了的芜箐(像大头菜)，这样余火就可以燃烧更长久。

The ember was placed inside a hollowed-out turnip to keep it glowing longer.

youdao