n.冲动；心血来潮；神经冲动；[物]冲量；[电]脉冲
vt.推动
He bought the house on an impulse. 他凭一时冲动买下了这所房子。
We were seized by a sudden impulse to run. 我们身不由己突然想跑。
On impulse, I picked up the phone and rang my sister in Australia. 我一时心血来潮，拿起话筒就给在澳大利亚的妹妹打了个电话。
He had a sudden impulse to stand up and sing. 他突然心血来潮，想站起来歌唱。
He grasped her hand on an impulse. 他情不自禁地握紧她的手。
impulse用作名词,意思是“冲动,突然的想法”,后面常接动词不定式作其定语,但不可接动名词。
impulse作“一时的想法,突然的想法”解时,是可数名词,可接动词不定式作表语。
脉冲
