Wyoming's Lonesome Lake captures a crystal clear likeness of Cirque of the Towers, a circular mountain-ringed basin in the Wind River Range.
怀俄明州的幽静的湖泊捕获了完全透明的圆环塔肖像，这是在风河山脉里圆形山所围绕的盆地。
A small circular caldera crowns the volcano. A little more than a kilometer across, the caldera is defined by walls that range from 80 to 300 meters high.
山顶有小圆形火山口，直径大约1千米，周围是80到300米高的墙（喷发岩形成的）。
Einstein's elevator; Artillery range; Uniform acceleration and circular motion using dimensional analysis.
爱因斯坦电梯；炮火射程；匀加速度和圆周运动的量纲分析。
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