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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.

一种防治近视眼的理疗器,它有作为物筒、目,还有头组,它用于人们在近距离上长时间用眼时戴在眼上,可以使被视物的像清楚、放大变远。

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agendas, agendum, Agene, agenesia, agenesis, agenize, Agenois, agent, agent bank, Agent Orange,

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3G, 401(K), a,

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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面 两侧,称为凸

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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.

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

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ager, agerasia, ageratochromene, ageratum, Agere, age-table, ageusia, ageustia, Agfa, Agfacolour,

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3G, 401(K), a,
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