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。
2
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？
3
For turning operations, the lathe USES a single-point cutting tool which removes metal as it travels past the revolving workpiece.