If a glass layer's shape is off so much as a fraction of a micron, the scope's precision takes a mighty blow.

只要有一层玻璃的形状差了仅仅千万分之一米，望远镜的精确度就会大打折扣。

youdao

If a glass layer's shape is off so much as a fraction of a micron, the scope's precision takes a mighty blow.

只要有一层玻璃的形状差了仅仅千万分之一米，望远镜的精确度就会大打折扣。

youdao