Residual is used to describe what remains of something when most of it has gone.
例句
...residual radiation from nuclear weapons testing...核武器实验后残留的辐射Turn the hotplate off and allow the residual heat to keep the mixture simmering.把烤盘关掉,让余热把混合物再煨一下。
英汉词典释义
adj.
存留下来的;剩余的;残余的
a residual value of 10% of its original cost相当于原值10% 的余值
英英词典释义
Noun
1. something left after other parts have been taken away;
"there was no remainder""he threw away the rest""he took what he wanted and I got the balance"
2. (often plural) a payment that is made to a performer or writer or director of a television show or commercial that is paid for every repeat showing;