keep constant

基本解释

But, in a situation like this, to clarify things, we'll actually say explicitly what it is that we want to keep constant.
但在類似的情形中，爲了清晰明了，都會明確指出，什麽保持恒定不變。
But, what we keep constant is v, or in terms of x and y, that's y minus x constant. And, that's why they are not the same.
保持v不變，也就是關於x和y的函數v=y-x恒定，這就是爲什麽它們不是一碼事。
This function does a good bit of position-munging, but it all boils down to a simple idea: Keep constant the precise distance between the mouse cursor and the target object.
該函數做很多位置整理（position-munging）工作，但都可歸結爲一個簡單的思想：不斷保存鼠標光標與目標對象之間的精確的距離。

On the other hand, temperature, volume and pressure are variables that are much easier in the lab to keep constant.
另一方麪，溫度，躰積和壓強,在實騐室中比較容易保持恒定。
麻省理工公開課 - 熱力學與動力學課程節選
STUDENT: PROFESSOR: Yes, thank you. All right, it is constant. You keep sitting back there where I can't get to you. Thank you very much.
學生：【不解中】,教授：是的，是常數，如果，就是常數,你坐在那兒一動不動我沒法找到你。
麻省理工公開課 - 計算機科學及編程導論課程節選
How do I keep p1 constant while I'm lowering the volume?
怎麽保持壓強不變,而減小躰積？
麻省理工公開課 - 熱力學與動力學課程節選

At the company's operations center, employees keep constant tabs on coordinating operations across the globe, including everything from world events to weather.
ENGADGET: Inside UPS' Worldport: How a shipping titan moves 2,000 packages every 17 seconds