词汇讲解：
1. double v. （使）加倍例句：The baby doubled its weight in a year.
那婴儿一年中体重增加了一倍。
2. partnership n. 合作关系，合伙例句：Our relationship is smooth and it is moving towards a partnership .
我们的关系是和谐的，并正在迈向伙伴关系。
3. intensive adj. 集中的，密集的，加强的例句：The goal was to see whether we could speed them up at all just by intensive training .
这么做的目的是为了看看我们到底能否通过强化训练加快他们的速度。
4. perception n. 认识，观念，看法例句：What's your perception of the matter?
你对此事有什么看法?
5. visa n. 签证例句：I obtained a visa to visit Japan.
我获得访问日本的签证。
6. grab v. 抓住例句：Joe grabbed him by the collar.
乔抓住他的衣领。
7. approve vt. 批准，通过例句：The minister approved the building plan.
部长批准了该建筑计划。
8. diplomacy n. 外交，外交手腕例句：This was done through the skill in diplomacy.
这是通过外交手腕才做到的。
9. strengthen v. 增强，巩固例句：They strengthened the city walls.
他们加固了城墙。
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