Despite their size, these vessels carry small crews, usually of around twenty men.
虽然个头大，这些轮船载船员却很少，一般只有二十人左右。
You can imagine what could happen when a small fishing boat confronted with giant vessels.
大家可以想象，一条小渔船和多艘大舰艇在一起会发生什么样的情况。
Around each alveolus there are capillaries, which are very small blood vessels.
在每一肺泡周围有许多毛细管，它们是很小的血管。
Our blood vessels also get small to save heat.
我们的血管也会变小来保存热量。
Our blood vessels also get small to save heat.
我们的血管也会变小来保存热量。
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