" And every young mammal has multitudinous opportunities, " Judy said.

" 每个年轻的动物都有各种各样的机会。" 朱迪说道。

But we call animals that bear live young mammals – and mammals are animals that feed on their mother's milk.

但我们称生有活的幼小哺乳动物的动物为生——而哺乳动物是以母乳为食的动物。

Even those which live in water have to come to the surface of the water to breathe. The young mammals grow in the bodies of their mothers.

甚至是那些在水中生活的动物也需要浮出水面来呼吸。幼小的哺乳动物在它们妈妈的身体里成长。

Such retreats are typical of young mammals when they encounter novel objects in their environment; they must assess the unknown entity for danger before they can contemplate playing with it.

当幼儿在环境中遇到新事物时，这种撤退很典型; 他们必须评估未知实体的危险性，然后才能考虑与它玩耍。