一个英语任务型阅读!

一个英语任务型阅读!
Some people say laughter is the best medicine.Scientists are beginning to agree with this.They are studying laughter seriously and finding it is really good for us.
So what happens when we laugh?We use fifteen defferent muscles in our face,and laughing is good for every organ in our body.When we laugh,we breathe quickly and exercise the face,shoulders and chest.Our blood pressure goes down,and our circulation gets better.Our heart beat gets slower and our brain makes a natural painkiller.
Every minute we laugh is the same as forty－five minutes of relaxation①.Many doctors around the world believe that laughter helps us get better when we are sick②.
Of course,there are many kinds of laughter.We may change the way we laugh in different situations.But we all have a laugh that is special to us.How do you usually laugh?
根据短文内容完成下列任务.
用学过的词解释①：
句意填词：If a man stops laughing suddenly,his heart best maybe gets .
3.把②译成汉语：
用一个英语句子描述本文的大意.