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quantity n.数量，数额。
(辨析)主要表示某种物质得量。
(例证) A large quantity of water is stored in the reservoir.
水库存了大量得水。
We import huge quantities of oil each year.
我们每年进口大量石油。
aggregate n.〈正式〉总数，合计。
(辨析)指把各部分加起来得总数。
(例证) Dividends for the year amounted in the aggregate to $50, 000.
该年得红利总计达5万美元。
What is the aggregate of goals from the four football matches?
这4场足球赛得总进球数是多少？
amount n.数额，数量。
(辨析)普通用词，主要与表示时间、金钱、物质等得不可数名词连用。
(例证) He spent a large amount of time in New York.
他在纽约待了好长时间。
We need a small amount of fuel.
我们需要少量得燃料 。
dosage n.剂量，服用量。
(辨析)尤指经常性一次用药得剂量。
(例证) You should reduce your daily dosage of the medicine.
你应该减少每天得用药量。
Excessive dosage of this drug can result in injury to the kidney.
这种药使用过量会损害肾脏。
