HSK 7-9
端正
duānzhèng形动
upright; regular; proper; correct
学生坐姿端正认真听讲。
Xué shēng zuò zī duān zhèng rèn zhēn tīng jiǎng.
The students sit upright and listen attentively.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.