脑珊瑚里的圣诞树管虫。

Christmas tree worms on brain coral.

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在肺部，布满粘液的支气管像树一样又分为成千上万个更小的管(细支气管)，他们连接到叫做肺泡的小囊。

Within the lungs, the mucus-lined bronchi split like the branches of a tree into tens of thousands of ever smaller tubes (bronchioles), which connect to tiny sacs called alveoli.

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首先，在花园里用水龙管淋浇你的圣诞树，晒干后再放进室内。

Firstly, hose down your tree in the garden and leave it to dry before bringing it inside.

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