把它们放在一起,用小角近似值。
I bring them together, and I use the small-angle approximation, small angles.
但是你不用用弹簧,做小角近似值,就像我们用摆做的一样。
But you never had to make any small-angle approximation with the spring as we had to do with the pendulum.
现在我们要,取近似值,我们将要取的,这个近似值,是我们经常在,物理上看到的-,我们称之为,小角度近似值。
And now we're going to make some approximations, and the approximations that we will make which we will often see - in physics when something oscillates — what we call the small-angle approximations.
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