2 sentences

1. 他一不留神，走岔了道。

   tā yī bù liú​shén, zǒu chà le dào.

   He took the wrong path because he wasn't paying attention.

   Source: Dong Chinese Dictionary

2. 这里的台阶非常陡，下楼梯的时候你要多留神。

   zhè​lǐ de tái​jiē fēi​cháng dǒu, xià lóu​tī de shí​hou nǐ yào duō liú​shén.

   The steps here are very steep, so you need to be careful when going downstairs.

   Source: Dong Chinese Dictionary