rapidity

/rəˈpɪdəti/ 31四级六级GRE
the quality of moving or reacting with great speed. "the fish sink into the sand with such rapidity that it must be seen to be believed"

noun [抽象名词]迅速,速度

The disease is spreading with alarming rapidity.
这种疾病正在以令人吃惊的速度蔓延。

单词造句: