The rotating contacts are made with copper or silver sheet and have rectangular shape glued on the wheel.
旋转接触与铜或银板，并有长方形胶结对车轮。
His pieces, hammered up and out from a single flat sheet of silver, have been praised for their "sublimely flowing" quality.
他的作品用平展的银片敲打而成，因其“绵延流动”的质地大获好评。
Top brands can be on the pricey side so if you're on a budget grab a cheap substitute such as a silver car sunscreen, reflective tanning mat or wrap a circular sheet of cardboard in aluminum foil.
名牌的反光板太昂贵，你可以用个便宜的替代品，比如银色的车用防晒遮光剂，反光的皮革衬垫，或者自己弄个一张包着铝箔的圆卡片。
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