重点讲解：
1. keep sb. informed 使某人不断获悉最新发展情况、消息等；
例句：We would like to keep you informed via email about product updates, upgrades, special offers and pricing.
我们希望通过邮件及时通知您关于产品更新、升级、特价或定价方面的信息。
2. be similar to 相像的；相仿的；类似的；
例句：The exercise period was similar to the previous study.
运动周期类似前面的研究。
3. focus on 集中（注意力）；关注；
例句：We're going to focus on the relationship between freedom and necessity.
我们将集中讨论自由和必要性之间的关系这一问题。
4. be due to do sth. 按理该做某事；按期;预定要做某事；
例句：He is due to face a court-martial on drugs charges.
他将因毒品交易的指控受到军法审判。
5. contribute to （为…）做贡献；
例句：Everybody should contribute to the discussion.
每个人都要参加谈论。
