We know they smear a liquid on the tube, but we don't know where they secrete it from or what its chemical composition is.
我们知道它们在管上涂抹了一种液体，但我们不知道它们从哪里分泌出这种液体，也不知道它的化学成分是什么。
We are spending billions to increase capacity on the Tube by 30 percent, in what is the biggest investment seen in decades.
我们将投入数十亿英镑来提高地铁三成容量，这是过去几十年来所投入的最大一笔资金。
What is the effect of head position changes on the depth of an endotracheal tube?
头部位置的变化对气管内插管深度有何影响？请详细描述。
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