重点讲解:
1. specialize in 专门从事;专门经营;专门研究;专攻;
They specialize in management consultancy.
他们专门从事管理咨询。
2. in charge of 主管;全面负责;统领;
He is i n charge of the school work.
他负责学校工作。
3. to date 迄今;到目前为止;
The police have not found the runaway to date.
警察迄今没抓到逃犯。
4. participate in 参加;参与;
No professionals may participate in the amateur tennis tournament.
任何职业选手均不得参加业余网球锦标赛。
adj. 剧烈的,严重的,严峻的,严厉的,严格的