Subject + 有效
The adjective 有效 (yǒuxiào) means 'effective' or 'valid.' It is composed of 有 (to have) and 效 (effect), literally meaning 'having effect.' It is used to describe methods, measures, documents, or agreements that produce the intended result or remain in force.
这个方法对减肥非常有效。
Zhège fāngfǎ duì jiǎnféi fēicháng yǒuxiào.
This method is very effective for losing weight.
你的护照还在有效期内吗?
Nǐ de hùzhào hái zài yǒuxiàoqī nèi ma?
Is your passport still within its validity period?
我们需要找到一个有效的解决方案。
Wǒmen xūyào zhǎodào yí gè yǒuxiào de jiějué fāng'àn.
We need to find an effective solution.