Turning away from the use of lenses, Newton devised the reflecting telescope, which makes use of a bowl-shaped metal mirror to focus the light from the stars.

牛顿不用镜头，而设计制作反射式望远镜，这种望远镜利用碗状的金属镜子来聚焦来自恒星的光。

youdao

Lisa: We just learned that a turning center removes metal. What operations can it perform, John?

丽莎：我们刚学到了车削加工中心去除金属。约翰，它能执行什么操作？

youdao

For turning operations, the lathe USES a single-point cutting tool which removes metal as it travels past the revolving workpiece.

在车削操作中，车床用一个单刃切削刀具在旋转的工件上进行金属切削。

youdao

He had a striking story, having survived the plunge in metal prices in 2001 by turning NovaGold into a sand-and-gravel producer in western Alaska.

FORBES: Mining The Hedge Funds

The materials then goes through a multi-tiered supply chain where they are sold and possibly resold several times before reaching facilities that specialize in either cutting and polishing gemstones and diamonds, or turning raw precious metal into jewelry-grade material.

FORBES: All that Glitters is Beauty and Business

Rust is the metal (Fe for iron) turning to the oxide (Fe2O3 normally for iron although there are other oxides).

FORBES: Will Handling Your iPhone 5 Damage It? Maybe...