英语语法问题，急！！！

Question

Finally, because the ultimate stakeholders are patients, the health research community should actively recruit to its cause not only well-known personalities such as Stephen Cooper, who has made courageous statements about the value of animal research, but all who receive medical treatment.
为什么是recruit to its cause要to? recruit 在这是什么意思？cause指的是什么?
不胜感激!

Answer 1

Finally, because the ultimate stakeholders are patients, the health research community should actively recruit to its cause not only well-known personalities such as Stephen Cooper, who has made courageous statements about the value of animal research, but all who receive medical treatment.
最后，因为最终获益者是病人，健康研究界不仅要积极利用颇受欢迎的著名影视名人， 如斯蒂芬 · 库珀，而且要让所有接受治疗的人，勇敢地说出动物研究的价值。
recruit 是招募意思，这里指请影视名人出来讲话。
cause指的动物研究的事业。

Answer 2

recruit就是招募的意思，cause在这指事业，即卫生研究事业，所以就是要积极招募到其事业中来，全段翻译再找我

Answer 3

Finally, because the ultimate stakeholders are patients, the health research community should actively recruit to its cause not only well-known personalities such as Stephen Cooper, who has made courageous statements about the value of animal research, but all who receive medical treatment.