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A physiotherapeutic apparatus for preventing and treating near sighted eye has a convex lens used as objective lens, lens cone, eyepiece, headgear and lens set.

一种防治视眼器，它有作为物凸透、筒、目，还有头套和透组，它用于人们在上长时间用眼时戴在眼上，可以使被视物像清楚、放大和变远。

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原声例句
Crash Course Physics 速成课物理

Say we have a lens that has a spherical face on both sides, known as a convex lens.

假设我们有一个具有球头 两侧，称为凸。

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世界新知焦：科技

This is made possible through something called a lenticular lens – a corrugated sheet in which each ridge is made up of a convex – or outward-curving – lens.

这是通过一种叫做柱东西实现，柱是一种波纹薄板，其每个凸起处都由凸（即向外弯曲）组成。

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