C （一次）剂量，一剂，一份a measured amount of a medicine given or to be taken at one time

　dose　的基本意思是人一次服药的“一剂”，接受放射线的“一次剂量”，也可表示“一次不愉快〔愉快〕的经历”。a dose可指一次用量，也指一段时间内分次用药的量。

　administer a ～　用药
　take three ～　服三次

　He gave me a dose of medicine for my cold.　他给我开了一剂治感冒的药。
　Take a dose of this cough syrup three times a day.　每天服三次这种止咳糖浆，每次一剂量。
　The bottle contains six doses of liquid medicine.　这个瓶子里有六次剂量的药水。
　In the accident, the workers received a heavy dose of radiation.　在那次事故中，工人受到大剂量的辐射。
　What you need is a good dose of laughter.　你需要的是大笑一场。

 ♣ like a dose of salts
　快速而轻易地　very quickly and easily
　He gets through his pay like a dose of salts.　一发工资，他就很快花个精光。

　［同义词］ portion
　［词源］古法语<近代拉丁语dosis（给）