有效

• 拼音: yǒu xiào
• 汉字拆解: 有 = 又 (hand) + 月 (moon/meat), meaning 'to have'; 效 = 交 (cross, exchange) + 攵(攴) (strike), meaning effect or result

含义

Effective; valid. Describes something that produces the desired result or is still within its period of validity.

Has two main uses: (1) effective — producing the intended result (有效的方法 = effective method), and (2) valid — within the valid period (有效期 = validity period). The opposite is 无效 (ineffective/invalid).

例句

1. 这个方法非常有效。
2. 你的护照还在有效期内吗？
3. 多喝水是预防感冒的有效方法。

用法指南

语境: medical, official, everyday

语气: practical

正确说法

• 这种药很有效。(This medicine is very effective.)
• 这张优惠券的有效期是三个月。(This coupon is valid for three months.)

错误说法

• 他是一个有效的人。(Don't use 有效 to describe a person — use 有效率 (efficient) or 能干 (capable) instead)

起源与历史

有 (to have) + 效 (effect, result). Literally 'to have effect' — effective.

文化背景

世代: All ages

社会背景: Universal