1、
The currents swirling between tunnels and caves don't always lead back to open water.
还有涌流的漩涡在隧道和洞穴之间时常不能引导潜水者回到水的开口.
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2、
3、
4、
Primitive people lived in caves and made tools from stones and animal bones.
原始人住在洞穴里并以石头和动物的骨来做工具.
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5、
