灵敏 (líng mǐn): smart; clever; sensitive; keen; quick; sharp

This police dog has a very sharp sense of smell and can quickly find the one piece of luggage hiding drugs among a pile of bags.

The touchscreen of this new phone is very responsive; as soon as your finger touches it lightly, the screen reacts immediately.

He is an experienced reporter with a keen news sense; he always manages to arrive first at the scene of a breaking event.

Blind people usually have sharper hearing than ordinary people; they can tell how many people are in a room by the sound of footsteps.