occlusion
noun specialized uk/əˈkluː.ʒən/ us/əˈkluː.ʒən/
(BLOCK)
[ C or U ] medical 栓塞（医学术语，血管或体内开口处的阻塞）
in medicine, something that blocks a tube or opening in the body, or when something is blocked or closed
(TEETH)
[ U ] medical （牙科术语）上下牙齿的咬合
in dentistry, the way in which your upper and lower teeth meet
(WEATHER)
[ C ] environment (also occluded front)锢囚锋（两个锋面相遇而形成的锋面，尤指冷空气将其前面的暖空气抬高而形成的锋面）
a situation in the weather when two masses of air meet, especially when a mass of cold air reaches warm air and pushes the warm air up off the earth's surface