青少年参加志愿者项目的原因可能是他或她的朋友也参加了这个项目。
A teen might join in a volunteer project because his or her friends are doing it.
到海外旅游或者参加交换项目的原因有很多，但最重要的原因是你可以开阔眼界。
There are numerous reasons to travel or go on an exchange, but the most important one is: it will broaden your horizons.
但是，如果由于道德上或是信念上的原因，不能参加实验项目的同学请与指导老师联系。
However, if for a moral or philosophical reason you feel that you cannot participate in the experimental exercise, please see the instructors.
但是，如果由于道德上或是信念上的原因，不能参加实验项目的同学请与指导老师联系。
However, if for a moral or philosophical reason you feel that you cannot participate in the experimental exercise, please see the instructors.
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