eyesight相关的词根或词缀是: sight

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People start to lose their eyesight around age 40 .

人们在40岁左右视力会开始下降。

Myth : reading in dim lighting ruins your eyesight .

传说：在昏暗的灯光下阅读会损害视力。

Some bats with poor eyesight depend on echolocation to navigate .

蝙蝠视力很差，它们通常用超声波定位来导航。

His eyesight recovered , but the pain was excruciating and he was starving .

这时他的视力也恢复了，但是他仍受剧痛和饥饿的折磨。

The study is part of a long-term project on eyesight at the government-funded council .

该研究是政府资助委员会的，长期视力研究项目的一部分。