尘埃温度远不及恒星，所以光学望远镜难以观测到。

Dust is nowhere near as hot as a star, therefore optical telescopes cannot observe it.

youdao

建设世界上最大的光学望远镜的计划已获批准。

Construction of world's biggest optical telescope has been approved.

youdao

当然，每个望远镜首先要考虑的是其光学表现。

Of course, the most important consideration of any telescope is the performance of its optics.

youdao

当然，每个望远镜首先要考虑的是其光学表现。

Of course, the most important consideration of any telescope is the performance of its optics.

youdao