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重点讲解：
1. concentrate on 全神贯注；集中（心思）；
Please concentrate on the business at hand and don't drag in irrelevant issues.
请你集中谈这件事，不要牵扯其他问题。
2. take effect 生效；见效；开始起作用；
After the policy took effect, more students chose jobs in areas like teaching and the nonprofit sector.
该举措生效后，越来越多的学生选择了教学和非盈利性质的工作。
3. speak highly of 说…的好话；称赞；
All who know him speak highly of him.
凡是认识他的人，没有不称赞他的。
4. call off 取消；
If the bad weather should continue, we would have to call off the match.
如果这种恶劣天气持续下去，我们就只好取消比赛了。
n. 传染病，流行病
adj. 流行的，传染性
