如果你以前曾探索过这一区域，请密切留意熟悉的景物——你可能会惊讶于，认出一块独特的岩石或一棵奇特的树竟能如此迅速地让人重获方向。

If you've explored the area before, keep an eye out for familiar sights—you may be surprised how quickly identifying a distinctive rock or tree can restore your bearings.

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这些连同有关地球总体构成的合理猜想，一起形成了我们熟悉的地球模型——铁质地核，岩石地幔和较薄的地壳。

These, together with reasonable guesses about the Earth's overall composition, have been used to put together the familiar model of an iron core, a rocky mantle and a thin crust.

youdao

这些连同有关地球总体构成的合理猜想，一起形成了我们熟悉的地球模型——铁质地核，岩石地幔和较薄的地壳。

These, together with reasonable guesses about the Earth's overall composition, have been used to put together the familiar model of an iron core, a rocky mantle and a thin crust.

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