2 sentences

1. 两个声部在此处以同音齐唱。

   liǎng gè shēng​bù zài cǐ chù yǐ tóng​yīn qí​chàng.

   The two voices sing in unison here.

   Source: Dong Chinese Dictionary

2. 运动员在颁奖仪式上齐唱国歌。

   yùn​dòng​yuán zài bān​jiǎng yí​shì shàng qí​chàng guó​gē.

   The athletes sang the national anthem together at the award ceremony.

   Source: Dong Chinese Dictionary