他拣起一块尖尖的大砂岩石，试图尖头朝下地把它安置在更大的一块圆石上。

He picks up a large, pointy piece of sandstone and attempts to place it - point down - on a much larger round boulder.

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尖齿叉子或干草叉等工具上的尖头。

A prong on an implement such as a fork or pitchfork.

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倒钩：武器或工具，如箭或鱼钩的尖头上按相反方向弯回去的尖钩。

Barb: a sharp point projecting in reverse direction to the main point of a weapon or tool as on an arrow or fishhook.

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尖刺尖头物，如冰戳，尖棒或荆棘。

A pointed object, such as an ice pick, a goad, or a thorn.

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尖刺尖头物，如冰戳，尖棒或荆棘。

A pointed object, such as an ice pick, a goad, or a thorn.

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