Undulation is one of the fundamental models of the geological effect, the undulation motion and variation in shape of earth crust is an geologic facts.
波动是地质作用的基本形式之一，地壳的波状运动和变形是客观存在的。
We cant do anything without harmony from cosmic space motion to individual living existence and variation.
大到宇宙空间的运动，小到个体生物的存在与变化，都离不开和谐。
The butterflies also appear and vanish by a steam variation synchronized with the butterflies' motion.
蒸气变化和蝴蝶的动作同步配合，使蝴蝶出现或消失。
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