Italian astronomer and mathematician; demonstrated that different weights descend at the same rate; perfected the refracting telescope that enabled him to make many discoveries (1564-1642).

数学家（1564-1642）；论证了不等重的物体下降速度相同；完善了折光式望远镜使他能够获得许多新的发现。

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The optical system of a refracting telescope is essentially the same as that of a compound microscope.

折射望远镜的光学系统与复显微镜的光学系统基本上相同。

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Here visitors can watch the sky through a 130 mm. refracting telescope.

在这里，参观的人可以通过一架130毫米的折射望远镜观看天象。

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