新的交通法规已经正式生效，请大家遵守。

Xīn de jiāotōng fǎguī yǐjīng zhèngshì shēngxiào, qǐng dàjiā zūnshǒu.

The new traffic regulations have officially come into effect; please follow them.

这份合同从明天开始生效。

Zhè fèn hétong cóng míngtiān kāishǐ shēngxiào.

This contract takes effect starting tomorrow.

只有在你签字之后，这个申请才会生效。

Zhǐyǒu zài nǐ qiānzì zhīhòu, zhège shēnqǐng cái huì shēngxiào.

This application will only take effect after you sign it.