2 sentences

1. 当夜幕降临时，他们已经筋疲力尽了。

   dāng yè​mù​jiàng​lín shí, tā​men yǐ​jing jīn​pí​lì​jìn le.

   By the time night fell, they were exhausted.

   Source: CCMatrix

2. 夜幕降临的时候，她最好的那张厨房椅已经被改得认不出来了。

   yè​mù​jiàng​lín de shí​hou, tā zuì​hǎo de nà zhāng chú​fáng yǐ yǐ​jing bèi gǎi de rèn bu chū​lai le.

   By the time night fell, her best kitchen chair had been altered all out of recognition.

   Source: CCMatrix