炙热的舞台灯光下，魔术师王显波拿出6个金属圆环，将它们一个个相互碰撞，然后连成了不同形状：花朵，人力车，飞机等等。
Sweating under stage lights, magician Wang Xianbo takes six metal rings, bumps them together one by one and then links the rings into shapes: a flower, a rickshaw, an airplane.
试验结果表明铝蜂窝圆芯、金属橡胶圆环及涡流磁阻尼都可以用作月球着陆器的阻尼材料或阻尼方式使用。
The experimental results show that all the aluminum honeycomb core, metal rubber annulus and magnetic damping of eddy current can be used as damping materials or modes of the lunar lander.
视场光阑是安装在目镜镜筒内的金属的圆环用来限定范围的大小。
The field stop is the metal ring inside the eyepiece barrel that limits the field size.
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