A number is a mathematical quantity, usually correlated in electronics to a physical quantity such as voltage, current, or resistance.

一些是一种数学数量，通常在电子相关的物理量中，如电压，电流，或阻力。

youdao

In order to relate turning these physical knobs to this quantity, which we don't have a very good feel for, we've got to have a feel for the slopes.

为了把这些物理量同我们不是很理解的这个量联系起来，我们必须对斜率有一定的了解。

youdao

A double can represent numbers up to about 1.8*10308, which covers almost any physical quantity I can think of.

double的最大值为 1.8*10308，几乎能够表示任何物理量。

youdao

OK, but in order to relate turning these physical knob to this quantity here, which we don't have a very good feel for, we've got to have a feel for the slopes.

热量是怎么进一步改变的,但是为了把这些物量同我们，不是很理解的焓联系起来，我们对微分已经有了一定的了解。

麻省理工公开课 - 热力学与动力学课程节选

They have a tough group with the world champions - and in my opinion the best team in the world - Brazil, a brave and physical Norwegian side and the unknown quantity of Morocco.

BBC: Confidence is key for Scotland