1.They are studying laughter seriously and finding it is really good for us.
2.Every minute we laugh is the same as forty-five minutes of relaxation.
3.We may change the way we laugh in different situations.
4.They try ways of giving blood to people who need it.
5.Later,doctors find that we do not all have the same kind of blood.
6.They also find that they can give any kind o blood to peopl of group AB.
翻译一下~~不要机译~要人工的!!
谢谢~~