小的近似值。
We used the small Angle approximation to make it work.
我们利用角度的近似值，来取得成功。
But you never had to make any small-angle approximation with the spring as we had to do with the pendulum.
但是你不用用弹簧，做小角近似值，就像我们用摆做的一样。
I bring them together, and I use the small-angle approximation, small angles.
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.
把它们放在一起，用小角近似值。
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