颊窝毒蛇的毒牙是长的空心管子。

The fangs of pit vipers are long, hollow tubes .

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但是普罗米修斯用一根空心管子从天府偷盗火种，再次取得了宝贵的天火。

But Prometheus regained the treasure, stealing it from heaven in a hollow tube.

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布拉默的钥匙(插图3下方)总体来说是一根末端开有和锁芯滑块相对应的7个缺口的空心管子。

Bramah key (at bottom of Figure 3) is basically a hollow rod with seven notches cut in the end that mate with corresponding sliders in the lock.

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