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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、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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3G, 401(K), a,

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心灵奇旅

Joe peered through the lens, wondering what he was supposed to be looking at.

乔透过镜筒惑着他应该看什么。

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Crash Course 天文篇

Bigger scopes are good for fainter objects, but are more expensive, and can be difficult to set up and use.

镜筒对观测更暗的物体比,不过它们也更贵,而且更难安装与使用。

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3G, 401(K), a,
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