Those telescopes that do not employ reflection use refraction .

那些不利用反射的望远镜利用的是折射。

Most astronomical telescopes employ reflection to focus starlight .

大多数天文望远镜采用反射式聚焦星光。

These large clouds may be detectable by earth-based telescopes .

这些巨大的云团可以从地球上的望远镜看到。

The brass telescopes mounted on its rails are beautiful objects .

轨道上美妙绝伦的黄铜望远镜就是其一。

Promising candidates are then checked again by ground-based telescopes .

有可能存在的候选行星将由地面望远镜进一步确认。