HSK 4
自习
zìxí动
to study outside of class time (reviewing one's lessons); to study in one's free time; individual study
晚上我在教室自习。
Wǎn shang wǒ zài jiào shì zì xí.
I study independently in the classroom at night.
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Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 4.