求翻译：四年里，我参与了一定的社会实践活动，还多次参加了多次设计大赛，很好的锻炼自己，包括专业知识、心理素质，使自己更加理性成熟。参与使我充实、快乐，使我成长。是什么意思？

Four years, I participated in a certain social practice, also has participated in numerous design competitions, good exercise their own expertise, psychological quality, to make themselves more rational and mature. Involved in that makes me full and happy, so I grew up.

4 years, I have been involved in a social practice, and also participated in many activities on many occasions the design contest, and is an excellent exercise, including i