A river flows toward the sea. But it does not reach the sea in one day. Every day, it moves a little. It finds its way around rocks. It changes direction. It passes through waterfalls. The river may not feel that it is getting closer to the sea. But when you look down from above, you can see that the whole river has been moving toward the sea from the very beginning. Our lives are often the same. Right now, we can only see today. We may feel lost. We may feel slow. We may wonder if we are moving

層流現象：原本流動的液體卻像突然靜止了