And this is a quantity that you know, right?

这时一个你已经知道的物理量，对吗？

麻省理工公开课 - 热力学与动力学课程节选

That is the whole triumph of calculus is to know that by looking at the position now, the position slightly later and taking the ratio and bringing later as close as possible to right now, we define a quantity that we can say is the velocity at this instant.

这就得靠微积分了,通过了解它现在的位置,和一小段时间以后的位置,计算它们的比,再让时间间隔尽可能缩短,我们就定义了一个,被我们称之为瞬时速度的物理量

耶鲁公开课 - 基础物理课程节选

An electronic probe loaded with the necessary drug in the right quantity could be introduced through a catheter into the body.

UNESCO: 2012 UK and Ireland Fellows

As well as concerns about the dignity of older clients, some 70% of respondents to the survey "expressed a lack of confidence that local authority-funded older clients always received the right quantity and quality of social care".

BBC: Adult social care suffering under cuts, survey suggests

Although nobody likes to see unflattering reviews, right now, quantity means more than quality in the local search algorithm.

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