有效 yǒuxiào effective
effective; in effect; valid
怎么记住“有效”: 有 have + 效 result = effective.
汉字
用法
- Stative verb/adjective: 这个方法很有效 (zhège fāngfǎ hěn yǒuxiào, this method is very effective).
- Common in 有效期 (yǒuxiàoqī, period of validity), printed on passports, tickets, and medicine.
- Compare 有用 (yǒuyòng, useful): 有效 is about producing the intended result or being officially valid, while 有用 is the broader "useful/of use."
例句
- 这张票三日有效。 Zhè zhāngpiào sānrì yǒuxiào.The ticket is good for three days.
- 希望下次能够有效。 Xīwàng xiàcì nénggòu yǒuxiào.I hope it'll work next time.
- 有效期到1997年3月31日为止。 Yǒuxiàoqī dào 1997nián 3yuè 31rì wéizhǐ.It's valid until March thirty-first, nineteen-ninety-seven.