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1.The hole size of the drill is small enough to fit in my hand.
钻头的孔径足够小，可以放进我的手掌。
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2.The diameter of the pipe is 50 cm, which is suitable for the size of the hole.
管子的直径是50厘米，适合孔的大小。
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3.The hole size of the drill bit is too large, causing it to break easily.
钻头孔径太大，容易断裂。