Deep test pits have shown that the floors of the rings are made of hardened limestone.

幽深的探坑里显示了这些层层的石柱环是由冷冰冰的石灰石制成的。

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So far, she and her colleagues have only excavated two small test pits at the cave, which contained a number of stone artefacts, bone points, animal remains, shell beads and fish hooks.

到目前为止，她和她的团队仅在洞内的两个小型试点进行挖掘，她们出土了一些石器、骨骼器具、动物残骸、贝类和鱼钩。

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Sump pits are very common in Canada and if you have one it's a good time to test its' operation and install the discharge hose outside (away from your house of course).

集水坑在加拿大非常常见。如果你家有集水坑，现在需要检查一下其运行情况，在外面装上泄水软管(当然要在你家外面喽！)

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