The sweet gum, sour gum, and some Australian eucalyptus trees are gum trees.

甜胶树 、 酸胶树和一些澳大利亚的尤加利树都是产树胶的树.

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The sweet gum gum , and some Australian eucalyptus trees are gum trees.

树和一些澳大利亚的尤加利树都是产树胶的树.

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Gum trees stood tall around us.

我们周围是一颗颗高高的桉树.

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