First, this tree is easy to climb.

第一，这棵树很容易攀爬。

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He's the first apple on the tree.

他是树上的第一个苹果。

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The first to emerge from his tree was Curly.

第一个从他的树上钻出来的是卷毛。

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To be systematic, I'm going to build this tree depth-first left-first.

为了保持系统性，我将要把这棵树设置,为深度优先和左边优先。

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