一块很重的石头可能是用来把锋利的石头打到表面上的。
A heavy stone may have been used to hit the sharp stone into the surface.
我的手指被一块锋利的石头划破了。
他用一块锋利的石头刮伤口。
他用一块锋利的石头刮伤口。
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.
最近发布的一项研究报告表明，居住在非洲南部的史前人类发明了远胜过欧洲旧石器时代的高超削石方法，此方法可把石头刮削成锋利的器具。
Prehistoric people in southern Africa developed a highly skilled way of shaping stones into sharp-edged tools long before Europeans did, suggested a study released recently.
所有的天蝎们，当你们走过海滩的时候，尽量不要跑到石头，锋利的贝壳或者其他可能伤到你的脚的东西上。
All Scorpios, watch where you walk on the beach, lest you run into a rock, sharp shell, or something else that would hurt your feet.
这些名为砾石的石器，是用另一块石头从火山玄武岩上敲下来的，具有锋利的刃。
The tools are known as cobbles, lumps of volcanic basalt Split by hitting them with another rock, leaving sharp cutting edges.
这些名为砾石的石器，是用另一块石头从火山玄武岩上敲下来的，具有锋利的刃。
The tools are known as cobbles, lumps of volcanic basalt Split by hitting them with another rock, leaving sharp cutting edges.
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