I would be a tube guard.

我要成为一个地铁警卫。

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Food that is planned to be carried inside the test-tube is examined by the guard that can reject it as garbage.

计划被搬进试管的食物被兵蚁检查，如果搬进的东西是垃圾的话，会被拒绝入内。

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Coast Guard rescuers airlifted the men from the mangled raft, which by then had also lost its floor and resembled a giant, battered black inner tube.

海岸警卫营救队员们将几个人从破烂不堪的救生筏中救了出来，筏底已经不知去向，整个救生筏就如同一只巨大的黑色残破内胎。

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