Correct
卖劲
/ mài jìn /
Strokes
Example
As a Verb
exert all one's strength; go all out; spare no effort; do one's utmost
1
Nàge
那个
xiǎo
小
nánhái
男孩
gànhuó
干活
hěn
很
mài
卖
jìn
劲
。
The little boy is really going all out in his work.
2
Mài
卖
jìn
劲
chànggē
唱歌
strain one's voice in singing