A wave occurs when many or all the ellipses rotate at the same rate.
A wave occurs when many or all the ellipses rotate at the same rate.
当许多或所有的椭圆以相同速率绕转时，便产生了一个波。
A wave occurs when many or all the ellipses rotate at the same rate.
当许多或所有的椭圆以相同速率绕转时，便产生了一个波。