This is the first time I participated in such a big event.
这是我第一次参加这样大型的活动。
I participated in Qi Gong training class in my junior year.
我在三年级时曾参加过气功训练班。
Earlier today, I participated in a World Health Organization forum.
今天早些时候，我参加了世界卫生组织的一个讨论会。
In college, I participated in many campus activities and social practice.
在大学期间，我参加了很多校园活动和社会实践。
I participated in many activities and had many chances to practice my English.
我也参加了很多户外活动，有很多机会锻炼我的英语。
I participated in many activities and had many chances to practice my English.
我也参加了很多户外活动，有很多机会锻炼我的英语。
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