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effectiveness
validity
If you keep a medicine too long, it may lose its potency.
Their most potent weapon was the Exocet missile.

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Open the tool →效力 (xiào lì) means “efficacy, effectiveness, validity”.
效力 is pronounced xiào lì in Mandarin Chinese.
“efficacy” is 效力 (xiào lì) in Chinese.
This page has 2 example sentences using 效力, each with pinyin and an English translation.