If the English teaching is a big tree, then the vocabulary should be the root.

如果说英语教学是一棵树，那么词汇就是支撑它的根基。

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A canker-root stopped in that big tree.

一只黄鹂鸟落在那棵大树上。

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A canker-root stopped in that big tree.

一只黄鹂鸟落在那棵大树上。

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