1 sentence

1. 由于长期熬夜，他的眼下出现了黑眼圈。

   yóu​yú cháng​qī áo​yè, tā de yǎn​xià chū​xiàn le hēi yǎn​quān.

   Due to staying up late for a long time, he developed dark circles under his eyes.

   Source: Dong Chinese Dictionary