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Americans use many expressions with the word dog. People in the United States love their dogs and treat them well. They take their dogs for walks, let them play outside and give them good food and medical care. However, dogs without owners to care for them lead a different kind of life. The expression, to lead a dog's life, describes a person who has an unhappy existence. 美国人使用很多和狗相关的词汇。在美国，人们喜欢狗，也善待它们。他们带狗散步，让它们到户外活动，并给它们提供优质食物与医疗。然而，无人照顾的流浪狗生活就大不一样了to lead a dog's life就描述了生活不尽如意的一类人。 Some people say we live in a dog-eat-dog world. That means many people are competing for the same things, like good jobs. They say that to be successful, a person has to work like a dog. This means they have to work very, very hard. Such hard work can make people dog-tired. And, the situation would be even worse if they became sick as a dog. 有人说，我们生活在一个竞争激烈的世界(dog-eat-dog world)。很多人竞争同一样东西，例如好工作。他们称，一个人想要成功就得拼命工作(work like a dog)。如此艰辛的工作使人疲惫不堪(dog-tired)。同时 ，如果他们病得厉害(sick as a dog)，情况会更糟。 Still, people say every dog has its day. This means that every person enjoys a successful period during his or her life. To be successful, people often have to learn new skills. Yet, some people say that you can never teach an old dog new tricks. They believe that older people do not like to learn new things and will not change the way they do things. | 
