Word Study 5.keen adj.锐利的；强烈的；敏锐的；热烈的， 渴望的 A kitchen knife needs a keen blade. A keen north wind blew through the gaps around the door. Even at the age of 95 he still had a keen mind. "His entire body hungered for keen sensation, emething exciting."(Richard Wright) Word Study 5. keen adj. 锐利的；强烈的；敏锐的；热烈的， 渴望的 A kitchen knife needs a keen blade. A keen north wind blew through the gaps around the door. Even at the age of 95 he still had a keen mind. “His entire body hungered for keen sensation, something exciting.” (Richard Wright)