他用一块砂纸把桌子的各个尖角磨圆。
He rounded off the sharp corners of the table with a piece of sandpaper.
奔流不息的河水，随着时间流逝，能够将边缘锋利的石头打磨光滑，与此类似，洋流也可以将冰块的边缘打磨圆润。
Just as the relentless movement of water in rivers and streams can smooth the jagged edges of rocks over time, ocean currents can smooth ice fragments into round shapes.
整个体育场从照片上看就像是一个磨圆了棱角的矩形，高高的围墙还在西南侧的地面上留下了常常的阴影。
Shaped roughly like a rectangle with rounded corners, the stadium sports high walls that cast long shadows toward the southwest.
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