HSK 6
脑子
nǎozi名
brains; mind
遇到问题要多动脑子。
Yù dào wèn tí yào duō dòng nǎo zi.
Use your mind when you encounter a problem.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 6.