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The mammals' journey into the oceans was a gradual one.
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The mammals' journey into the oceans was a gradual one. 哺乳动物进入海洋的过程是渐进式的

But milk wasn't the early mammals' only secret weapon.
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But milk wasn't the early mammals' only secret weapon. 但是母乳并不是 早期哺乳动物唯一的秘密武器

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