孩子们应该总是由一个会游泳的成年人照看。
Children should always be supervised by an adult who can swim well.
会走路的哺乳动物和会游泳的鲸鱼之间的差异是如何衔接起来的？
How was the gap between a walking mammal and a swimming whale bridged?
这些无法归类的动物包括被称为奇虾的会游泳的大型食肉动物，以及叫做威瓦亚虫的软体动物，它们以岩屑和藻类为食。
These unassignable animals include a large swimming predator called Anomalocaris and a soft-bodied animal called Wiwaxia, which ate detritus or algae.
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