重点讲解：
1. participate in 参与；参加；
例句：Mary did not participate in the discussion.
玛丽没有参加讨论。
2. take part in 参加；参与；
例句：We both took part in the cut and thrust of debate.
我俩都参加了这场针锋相对的辩论。
3. according to 依据，根据，依照 （原则等）；
例句：According to law, a doctor must be present at the ringside.
按法律规定，场边必须有一名医生。
4. in addition to 另外；加之；除…之外；
例句：Dr. Jones emphasizes exercise in addition to a change in diet.
约翰医生强调不仅要改变饮食还要锻炼身体。
