1. system n. 系统，体系，制度，方法
【例句】 The computer system broke down.
What are the differences between the American and British systems of govern-ment?
The teacher has a special system of teaching chemistry.
2. theory n. 学说，理论
【例句】 Einstein put forward his new theory of relativity.
The plans are good in theory, but they won’t work in practice.
【妙语巧记】 Practice is better than theory. 行动胜于空谈。
3. violent adj. 剧烈的，强烈的，凶暴的，暴力的
【例句】 The boat sank in a violent storm at sea.
The madman was violent and had to be locked up.
Children should not be allowed to watch violent movies.
【拓展】 violence n. 暴力，(感情) 狂热；violently adv. 剧烈地，强烈地，使用暴力地
【妙语巧记】 Violent fires soon burn out. 野火烧不尽，春风吹又生。
Nothing good ever comes of violence. 暴力之树不结善果。
