1、rapidly是一个渐变的过程 如 4. The company developed rapidly under his administration. 在他的管理下，公司发展得很快。

2、 5. The city is developing rapidly and property in the center is becoming more expensive. 这个城市在飞速发展，市中心的房地产价格越来越贵。

3、 6. A bean grows rapidly. 豆类植物生长很快。

4、 8. We are mechanizing rapidly. 我们正在迅速机械化.