Correct
闷头儿
/ mēn tóur /
Strokes
Example
As a Verb
keep/get one's head down; work hard quietly/silently
1
Mēntóur
闷头儿
xiězuò
写作
immerse oneself in writing
2
Mēntóur
闷头儿
xiǎng
想
wèntí
问题
brood over a problem
3
Mēntóur
闷头儿
gànhuór
干活儿
plod away at a task silently
4
Mēntóur
闷头儿
bèikǎo
备考
get one's head down and work for one's exam