古代中国では、陰気と陽気が交わって万物が生じると考えられた。
In ancient China, it was believed that all things arose from the interplay of yin and yang energy.
冬至は陰気が極まる時とされる。
The winter solstice is held to be the time when yin energy reaches its peak.
陰気が強まると、体が冷えやすくなると東洋医学では説く。
Eastern medicine teaches that when yin energy grows strong, the body tends to become cold.