2 sentences

1. 因为下雨没法去野餐，他感到很扫兴。

   yīn​wèi xià​yǔ méi​fǎ qù yě​cān, tā gǎn​dào hěn sǎo​xìng.

   He felt disappointed because the rain ruined the picnic plans.

   Source: Dong Chinese Dictionary

2. 别在大家高兴的时候说这种扫兴的话。

   bié zài dà​jiā gāo​xìng de shí​hou shuō zhè zhǒng sǎo​xìng de huà.

   Don't say such a buzzkill when everyone is happy.

   Source: Dong Chinese Dictionary