大約 85% 的人一次只用一個鼻孔呼吸

About 85% of people breathe through only one nostril at a time

healthy PIG
You might think that your nostrils share the workload when inhaling and exhaling. While they do, it's not exactly what you think. You actually breathe in and out through one nostril at a time. Every few hours, the active nostril takes a break and the other one takes over, until eventually it switches back again.