experimental fact - that many springs-- - we call them ideal springs-- for many springs, this force is proportional to the displacement, x.
很多弹簧做过实验后,得出的事实-,它们叫做理想弹簧-,对很多弹簧来说,这个力,和移位x成比例。
m1a1=m2a2 it is now an experimental fact that m1 a1 equals m2 a2 and this product, ma, we call the force.
我们现在已知2,我们把ma的积称为“力
in any particular case, it is a matter of experimental fact whether the variations are in accordance with the normal law or not.
在任一特定的情形下,实验的实际情况是,其结果的变化要么符合正态误差法则,要么不符合这个法则。
it is experimental fact that a high grade uranium tetrafluoride can be prepared, if we use denitrated mixed uranium oxides produced by one and half step method.