英语翻译

There is also some evidence to suggest that laughter helps the body’s immune system
有证据表明欢笑可以促进人体的免疫系统
that is,the system which fights infection
这个系统是防止感染疾病的
.In an experiment,one group of students watched a funny video while another group served as the control group-in other words,a group with which to compare the first group
在一个试验中,一组人观看搞笑片,另一组人在控制下,换句话说就是另一组人与第一组人形成对比
Doctors checked the blood of the students in both groups and found that the people in the group that watched the video had an increase in the activity of their while blood cells
医生化验了两组学生的血,发现看搞笑剧的一组学生血液中白细胞增多
that is,the cells which fight infection.
这种细胞是防止感染的