2 sentences

1. 很多人觉得，出现黑眼圈是夜晚熬夜的缘故。

   hěn​duō rén jué​de, chū​xiàn hēi​yǎn​quān shì yè​wǎn áo yè de yuán​gù.

   Many people believe that dark circles under the eyes are caused by staying up late at night.

   Source: CCMatrix

2. 参与者还报告了更明亮的眼睛，更清晰的皮肤和更少的黑眼圈。

   cān​yù​zhě hái bào​gào le gèng míng​liàng de yǎn​jing, gèng qīng​xī de pí​fū hé gèng shǎo de hēi​yǎn​quān.

   Participants also reported brighter eyes, clearer skin and fewer dark circles.

   Source: CCMatrix