impulse /imˈpʌls/ n. ［c］ & ［u］ 1. 冲动，突然的欲望：follow a sudden impulse 凭一时冲动; the sexual impulse 性欲冲动［考句］In fact as he approached this famous statue, he only barely resisted the impulse to reach into his bag for his camera.事实上当他靠近这座著名的雕像时，那无法抗拒地的冲动促使他到包里去掏相机。on impulse突发奇想：I wasn’t looking for some new shoes - I just bought them on impulse. 我不在瞅新鞋子，我买鞋子只是突发奇想。2.脉冲：an electrical impulse 电脉冲；impulse of heart 心脏的搏动