2 sentences for 警示 (jǐng​shì)

1. 路边竖立着一块警示牌，提醒司机减速慢行。

   lù​biān shù​lì zhe yī kuài jǐng​shì pái, tí​xǐng sī​jī jiǎn​sù màn xíng.

   A warning sign is posted by the road, reminding drivers to slow down.

   Source: Dong Chinese Dictionary

2. 老师常用这个案例来警示学生不要虚度光阴。

   lǎo​shī cháng yòng zhè gè àn​lì lái jǐng​shì xué​sheng bù yào xū​dù guāng​yīn.

   The teacher often uses this example to warn students not to waste their time.

   Source: Dong Chinese Dictionary