2 sentences

1. 交通信号灯变红后，所有的车辆都保持静止。

   jiāo​tōng xìn​hào​dēng biàn hóng hòu, suǒ​yǒu de chē​liàng dōu bǎo​chí jìng​zhǐ.

   After the traffic light turned red, all the vehicles remained stationary.

   Source: Dong Chinese Dictionary

2. 如果物体受到的合力为零，它将保持静止状态。

   rú​guǒ wù​tǐ shòu​dào de hé​lì wéi líng, tā jiāng bǎo​chí jìng​zhǐ zhuàng​tài.

   If the resultant force on an object is zero, it will remain at rest.

   Source: Dong Chinese Dictionary