1. Whale is not a fish; it is a mammal.
    鲸不是鱼类，它是一种哺乳动物。

2. Word last week that a scientist named Ian Wilmut had succeeded in cloning an adult mammal — an achievement long thought impossible — caught the imagination of everyone.
    上周有消息说，一位名叫伊恩·威尔莫特的科学家已经成功地克隆了一只成年哺乳动物，而这项成就长期以来被认为是不可能的。

3. Scientists in Scotland recently announced that, for the first time, they have cloned an exact copy of an adult mammal.
    苏格兰科学家最近宣称，他们第一次克隆了一只成年哺乳动物。