需要量的英文：
demand quantity
requirement

参考例句：

Television sets and stereo sound sets are now in great demand
电视机和立体声音响设备现在的需要量很大。

Nutritionists set requirements of dietary fiber at 25- 50 gday.
营养学家规定膳食纤维的需要量为25～50g日。

Pure wool is often mixed with other type fibers and recovered wool to meet the demand.
纯羊毛通常与其它纤维或再生毛混纺以满足需要量。

People who are overweight should look at their calorific, nutritional and dietary requirement beforehand.
超重的人应该看看他们对热量，营养和规定食物的需要量是什么。

The vitamin B12 requirements appear to depend upon the levels of choline, methionine and folic acid in the diet
维生素B12的需要量决定于食品中胆碱、蛋氨酸以及叶酸的含量。

According to this model a monolayer of fines coating the coarse is the minimum needed to bring the viscosity down
按照这个模型，粗粒物料覆盖以单层细粉是使粘度降低至细粉粘度的最小需要量。

demand是什么意思：
n. 要求，所需之物；需求，需要
v. 要求；询问，质问；命令；需要

It is the demand, stupid.
傻瓜，答案是需求。

Demand exceeds supply. The supply is not adequate to the demand．
供不应求

I demand a recount.
我要求重算。

quantity是什么意思：
n. 量，数量，许多，大量

dimensionless quantity
无因次值|无量纲的量

Bill of quantities: The specification of the quantity of materials to be used.
工程量清单;建筑工程清单;数量清单:指项目所用材料的数量及其规格的清单。见priced bill of guantities

Quality is better than quantity
不求其多,但求其精

requirement是什么意思：
n. 需要；必需品；要求；必要条件；规定

Is the requirement compulsory?
必须按这个需求做吗？

In practice, this will often require a prioritization of your job requirements.
实务上，这往往需要重新调整工作的优先顺序。

All systems requiring accurate timing will require a crystal.
所有需要精确定时的系统都要用晶体。