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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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flower girl, flower head, flower people, flower stalk, flowerage, flowerbed, flower-brick, flower-deluce, flower-de-luce, flowered,

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3G, 401(K), a,

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Crash Course Physics 速

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

假设我们有个具有球面的镜头 两侧,称为凸透镜。

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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.

这是通过叫做柱状透镜的东西实现的,柱状透镜是纹状的薄板,其每个凸起处都由凸透镜(即向外弯曲的透镜)组

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flowershow, flowery, flowing, flowline, flow-line, flowmeter, flown, flow-off, flow-out, flowrate,

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3G, 401(K), a,
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