Depending on the chemical or biological agents in the environment, a half mask may not be sufficient because the eyes are very sensitive to chemicals and offer an easy entry point for bacteria.

因为眼睛对化学品很敏感且很容易成为细菌的入口，所以半面罩可能无法充分防护，这取决于环境中化生毒剂种类和含量。

youdao

You want your content to be readable and easy on the reader's eyes.

你想你的内容就容易阅读和读者的眼睛。

youdao

Less accuracy, lower speed and easy to be influenced by individuals are characteristic of the traditional optical level, on which the measured data are read by human eyes mainly.

传统光学水准仪主要靠人工目视读数，存在精度低、测量速度慢、易受人为影响等问题。

youdao