| 单词 | gastrointestinal tract |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔carcinoid〕A small tumor, usually found in the gastrointestinal tract, that secretes serotonin.类癌瘤：通常在胃肠道里发现的一种小肿瘤，分泌血清素美国传统〔strongyle〕Any of various nematode worms of the family Strongylidae, often parasitic in the gastrointestinal tract of mammals, especially horses.圆线虫：一种圆线虫科的线虫，经常寄生于哺乳动物的胃肠区，尤其是马的胃肠美国传统 |
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