自从开学以来他参加了三项比赛的翻译：Since the school he participated in three competitions 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Since opening three games since he joined the

Since the school he participated in three competitions

Since has begun school he to attend three competitions

Since school since he has participated in the competition 3

Since the school he participated in three competitions