这颗尚未切割的钻石比一只高尔夫球还要大三分之一。

The uncut diamond is a third bigger than a golf ball.

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之所以这么说，是因为根据在埃塞俄比亚的新发现，大约在340万年前，一种可能和著名化石露西同种的猿人就开始使用石器工具切割大型哺乳动物的肉。

Because new discoveries from Ethiopia show that what was likely the species of the famous fossil Lucy used stone tools to butcher meat from big mammals-about 3.4 million years ago.

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钝工具比锋利工具更为危险，因为使用钝刀片切割需用更大的力气。

Dull tools can be more hazardous than sharp ones, since it takes more force to cut with a dull blade.

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