1. 宠物
    A pet is an animal that you keep in your home to give you company and pleasure.

    e.g. It is plainly cruel to keep turtles as pets.
           显然，养海龟作宠物十分残忍。
    e.g. ...a bachelor living alone in a flat with his pet dog...
           带着宠物狗独自住在一所公寓里的单身汉

2. 很喜欢的；钟爱的
    Someone's pet theory, project, or subject is one that they particularly support or like.

    e.g. He would not stand by and let his pet project be killed off...
           他不会袖手旁观任由他最看好的项目被扼杀。
    e.g. The example is chosen solely for its aptness in illustrating the current pet theory of the critic.
           选择这个例子仅仅是因为它能说明这位评论家目前最钟爱的理论。

3. （表示喜欢、友好的称呼）宝贝，乖乖
    Some people call the person they are talking to 'pet' to show affection or friendliness.

    e.g. It's all right, pet, let me do it.
           没事儿，宝贝儿，让我来吧。

4. 抚摸；（爱抚地）摩挲
    If you pet a person or animal, you touch them in an affectionate way.

    e.g. The policeman reached down and petted the wolfhound...
           警察伸手抚摸那只猎狼犬。
    e.g. I petted and smoothed her hair.
           我轻抚着捋平她的头发。