If you peel birch bark in the winter, we call it "the winter bark", another layer, a tougher inner layer of the tree adheres to the bark, producing a stronger material.

如果你在冬天剥桦树皮，我们称它为“冬树皮”，另外一层更加坚硬的紧贴树皮的树层就可以生产出更强更硬的材料。

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Another example of mutualism would be the bull's horn acacia tree, which grows in Central and South America.

互惠共生的另一个例子是在中美洲和南美洲生长的牛角相思树。

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Amazingly, the trees grow in such a way that their leaves and branches, although close together, never actually touch those of another tree.

令人惊讶的是，这些树的枝叶虽然挨得很近，却没有真的接触到另一棵树的枝叶。

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Another climber,John Lang, suggested Bachar free-solo an area called Double Cross, in Joshua Tree National Park,California.

VOA: special.2009.12.09

For a quieter stay, book into options like Bayrams (five minutes from the beach, families with children welcome, cushioned little gazeboes perfect to chill out during the day and night), recently built Turkmen tree houses with hammocks in the garden, also close to the beach or Orange Pension - another tree hostel in the middle of the orange grove.

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Several historians, when confronted with the question, speculated that the basketball bracket could have its roots in another organizational art form: the family tree.

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There is another anxiety reflected in that little oak tree, though.

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