The patient suffered a sudden decrease in the blood supply to part of her brain.那位病人通往大脑某一部分的血液供应量突然减少。A sudden drop in supplies of certain chemicals could knock the bottom out of the engineering industry.某些化学品供应的突然减少会造成工程行业的不景气。He had a sudden drop in income.他的收入突然减少了。His income took a sudden drop.他的收入突然减少了。