33 篇文章
For a start, it's tricky to keep it clean.
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For a start, it's tricky to keep it clean. 首先 想保持干净就有点难度

After laying their eggs, the petrels take time out to clean their plumage.
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After laying their eggs, the petrels take time out to clean their plumage. 产蛋后雪海燕会在抽出时间在雪地里整理羽毛

Perhaps to clean her fur,
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Perhaps to clean her fur, 也许是为了清洁皮毛