n.迅速,急速;速度;险峻;快度;
例句:
The strength of the current depends on the rapidity of movement.
电流的强度取决于运动的速度.
That Beijing was stung was apparent in the rapidity of its reply.
北京的答复异常迅速,明显地表明它被刺痛了.
The styles change with bewildering rapidity.
风格多变,令人应接不暇.