Cách sử dụng
The word 'undulation' refers to a wave-like motion or movement. We can use it to describe things that move or appear to move in a smooth, flowing manner. For example, the ocean waves undulate as they move towards the shore. We can also use it to describe the motion of a snake or a person's hips when they dance. When we say something undulates, we mean that it moves in a way that is similar to the movement of waves.