My duodenum produces a substance called secretion, which empties into joe's bloodstream.
我的十二指肠生产一种名叫分泌素的物质，排入乔的血流。
Acne occurs when there is an excessive secretion of sebum, a substance from the hair follicles.
痤疮发生时，有一个过度分泌的皮脂，这种物质来自毛囊。
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