copper中等

It was a musician who discovered the planet Uranus in the 18th century by making his own telescope with mirrors composed of copper and tin.

18世纪，正是一位音乐家用铜锡合金制成的镜片自制望远镜，发现了天王星。

During the 1840s and 1850s, in the early days of photography, exposure times were notoriously long: the daguerreotype photographic method (producing an image on a silvered copper plate) could take several minutes to complete, resulting in blurred images as sitters shifted position or adjusted their limbs.

在19世纪40年代和50年代，即摄影的早期，曝光时间之长是出了名的：银版照相法（在镀银铜板上成像）可能需要几分钟才能完成，拍摄对象一挪动位置或调整四肢，图像就会模糊。

At a worktable inside the transformer plant, young Jason Stenquist looks flustered by the copper coils he’s trying to assemble and the arrival of two visitors.

在变压器厂的一张工作台前，年轻的杰森·斯滕奎斯特面对他正试图组装的铜线圈和两位来访者的到来，显得有些慌乱。