Then once you've got those two numbers, they're no longer free parameters; they're concrete numbers, maybe 5 and 9.

一旦你知道这两个量,它们就不再是自由参量了,它们是具体的数值,可能是5或9

耶鲁公开课 - 基础物理课程节选

I told you once you know the free parameters, R0 and v0, you know everything about the future of the object.

一旦给定自由参量 R0 和 v0,你就能知道这个物体之后的运动状态

耶鲁公开课 - 基础物理课程节选