啃倒树木，以便取食物并获得造窝的材料。

The chews down trees to get food and material with which to build its home.

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小燕子造窝有进展。

The swallows make progress in building their nest.

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它们会在春天来临时苏醒并造个新窝。

They wake up again in spring to start a new nest.

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它们会在春天来临时苏醒并造个新窝。

They wake up again in spring to start a new nest.

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