一个英语句子的翻译----高手进

翻译：也有一些证据表明笑能帮助身体的免疫系统，免疫系统即与感染病毒抗争的系统。在一次试验中，一组学生观看一段有趣的视频而另一组则是对照组--意思即，另一组的作用是与第一组对比。医生检测两组成员的血液发现，观看视频的那组成员血细胞-即抵抗病毒的细胞--的灵活性增加。
1.分析：found在里面是谓语，that是宾语提示词，即其后的剩余部分是宾语从句。“the people”是宾语里面的主语(如果你明白什么叫嵌套会好理解一些）， in the group是定语词组，修饰它前面的主语“the people", "that watched the video"也是定语从句，它修饰的是它前面的词"group". "had an increase in the activity of their while blood cells"是比较好理解了，“在血细胞的灵活性方面有增长”，"that is, the cells which fight infection"是定语从句，修饰它前面的blood cells.
2.in the activity of 不是短语词组。in the activity+of，in表示在什么方面，of后面的their while blood cells是补充activity的。如，friends of my wife--我老婆的朋友，student of the school--学校的学生，等

found ( that the people in the group that watched the video 主语) had （谓语）an increase in the activity of their while blood cells, that is, the cells which fight infection

an increase 是宾语，
in the activity of their white blood cells, 是地点状语
前面半句意思： 发现观看视频的那组人，他们的白血球细胞的活跃性有了提升。

后面半句： that is the cells which fight infection 定语从句，修饰white blood cells.

1、从句嵌套而已，found that 发现了什么，that引出从句；the people，这些人， 从句的主语；in the group that watched the video ，在看了视频的那组，对the people 的补充，that后面是对group的补充；had an increase in the activity of their while blood cells，血细胞活性增加，从句的谓语和宾语；that is, the cells which fight infection，对抗传染病的细胞，这部分是修饰 blood cells。其中这个while我很诧异，看看是不是打错了？？？？
全译是，xxx发现，看了视频的那组人的血细胞，也就是对抗传染病的细胞的活性增加。
2、不是，had an increase in是一套，不是固定搭配，根据前后文变化，the activity of ，常用搭配，xxx的活性，也不是固定的，of是根据后文变化的，不过大多数情况都是of。

hat watched the video had an increase in the activity of their while blood cells, that is, the cells which fight infection.修饰 group
in the group 修饰people
the cells which fight infection.”解析their while blood cells
that the people in the group that watched the video had an increase in the activity of their while blood cells, that is, the cells which fight infection.”作 found 宾语从句
in the activity of 不是短语，只是表达 无生命的事物的活动

found(宾语从句) that the people in the group that watched the video had an increase in the activity of their while blood cells, that is, the cells which fight infection.
the people in the group （定语从句）that watched the video had an increase in the activity of their while blood cells, that is, the cells which fight infection.
in the activity of their white blood cells在白细胞的活动性方面（增加）