玛丽从未有过自己的动物宠物，她总是想要一只。
Mary had never possessed an animal pet of her own and had always thought she should like one.
孩子先把家养的宠物猫称为“猫”，然后把这个称呼扩大到其他看起来像猫的动物。
A child first labels the household pet cat as a "cat" and then generalizes this label to other animals that look like it.
他们打扫笼子，和动物玩耍，给宠物喂食和洗澡，还带着狗散步。
They clean cages, play with the animals, feed and bathe the pets and take the dogs for walks.
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