英文：A small stone found in the stomach of some reptiles, fish, and birds that aids in digestion by helping grind ingested food material.
中文：胃石一种小石头，常发现于某些爬虫、鱼和鸟的胃中，通过帮助碾磨食物来帮助消化
英文：Material, usually of plant or animal origin, that contains or consists of essential body nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals, and is ingested and assimilated by an organism to produce energy, stimulate growth, and maint
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