A depression similar to that in a shallow concave container for food.
A depression similar to that in a shallow concave container for food.
凹形，凹面与浅的凹型盛食物的容器相似的凹处
A depression similar to that in a shallow concave container for food.
凹形，凹面与浅的凹型盛食物的容器相似的凹处