Noviro
无效
HSK6
Simplified 无效
Traditional 無效
Pinyin wú xiào
Definition not valid; ineffective; in vain
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效
xiào
to imitate
效果
xiào guǒ
result; effect; efficacy; (theater) sound or visual effects
HSK3
有效
yǒu xiào
effective; in effect; valid
HSK3
效率
xiào lǜ
efficiency
HSK4
成效
chéng xiào
effect; result
HSK5
效劳
xiào láo
to serve (in some capacity); to work for
奏效
zòu xiào
to show results; to be effective
失效
shī xiào
to fail; to lose effectiveness