New words：

rapid [ˈræpɪd] adj.瞬间的；短时间内发生的；迅速的；快速的
rapidly ['ræpɪdli] adv.迅速；高速；急速地；急促

Sample Sentences：

The cells began to divide rapidly.
The disease is spreading at a rapid rate.
He has made rapid progress in his studies.

progress [prəˈɡres] n.进展；进步；进程；前进

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