小行星碰撞后的碎片可能会含有大量的铱，而大气洋流会把这些物质带到全球各地。
Debris thrown into the atmosphere by an asteroid collision would presumably contain large amounts of iridium, and atmospheric currents would carry this material all over the globe.
他们必须避免某些含有大量酪胺的食物，这种化学物质存在于多种奶酪、葡萄酒和泡菜中。
They must avoid certain foods that contain high levels of the chemical tyramine, which is found in many kinds of cheese, wines, and pickles.
科学家很久以前就知道，由于生存环境恶劣，青蛙的皮肤中含有大量能够对抗微生物的物质。
Scientists have long known that the skin of frogs contains plenty of powerful germ-fighting substances because of the hostileenvironments they exist in.
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