HSK 4
熟悉
shúxi动
to be familiar with; to know well
我对这座城市已经很熟悉。
Wǒ duì zhè zuò chéng shì yǐ jīng hěn shú xi.
I am already very familiar with this city.
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Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 4.