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无效
wú xiào
not valid, ineffective, in vain
HSK 6 (v3.0)
Examples
宣布无效。
Xuānbù wúxiào.
Declare invalid.
治疗无效。
Zhìliáo wúxiào.
Treatment failed.
密码无效。
Mìmǎ wúxiào.
Invalid password.