颊窝毒蛇的毒牙是长的空心管子。
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.
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.
有可能是用动物骨头制成的管子来喷洒，因为在附近发现了空心骨头，有些骨头上沾有颜料。
It is possible that tubes made from animal bones were used for spraying because hollow bones, some stained with pigment, have been found nearby.
铁条是实心的，管子是空心的。
铁条是实心的，管子是空心的。
铁棍是实心的，而管子是空心的。
铁棍是实心的，而管子是空心的。
由于竹子是空心的，还可以把它们连接起来当作管子输水。
And because it is hollow, it can be fitted together and used. for pipes to carry water.
由于竹子是空心的，还可以把它们连接起来当作管子输水。
And because it is hollow, it can be fitted together and used. for pipes to carry water.
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