HSK 6
限于
xiànyú动
to be limited to; to be confined to
本次优惠只限于学生使用。
Běn cì yōu huì zhǐ xiàn yú xué shēng shǐ yòng.
This discount is limited to students.
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Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 6.