Correct
余热
/ yúrè /
Strokes
Definition
residual heat/surplus heat/fig. old people's capacity for work
Example
As a Noun
afterheat; surplus energy; waste heat
1
Lìyòng
利用
yúrè
余热
qǔnuǎn
取暖
harness/use surplus thermal energy for heating purposes
2
Huíshōu
回收
yúrè
余热
reclaim waste heat
As a Noun
contribution/accomplishment after retirement
3
Fāhuī
发挥
yúrè
余热
do what one can during one's retirement; do one's bit in one's senior years; have a second career