3 sentences

1. 婚姻不是儿戏。

   hūn​yīn bù shì ér​xì.

   Marriage is not child's play.

   Source: OpenSubtitles

2. 这种关乎生死的大事，岂能视同儿戏？

   zhè zhǒng guān​hū shēng​sǐ de dà​shì, qǐ néng shì​tóng ér​xì?

   How can a matter of life and death be treated as child's play?

   Source: Dong Chinese Dictionary

3. 孩子们在草地上玩着简单的儿戏。

   hái​zi men zài cǎo​dì shàng wán zhe jiǎn​dān de ér​xì.

   The children were playing simple games on the grass.

   Source: Dong Chinese Dictionary