extemporized的音标：...

The president extemporized a speech after the working dinner.总裁即席发表了一篇工作餐后演说.He extemporized a speech at the wedding.他在婚礼上发表了即席讲话....

v.即兴创作，即席演奏( extemporize的过去式和过去分词 )...