X-ray examination of thin slabs of rock sometimes reveals the ghostly outlines of tentacles, digestive tracts, and visual organs of a variety of marine creatures.

对岩石薄片的 X 射线检查有时会发现可怕的触角轮廓、消化道和很多种海洋生物的视觉器官。

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Yogurt, like other "probiotic" foods, helps to promotes the growth of favorable bacteria in our digestive tracts.

酸奶，像其它的“益生菌”食品一样，有助于促进有利细菌在我们的消化道生长。

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Objective to increase the levels of diagnosis and differential diagnosis to the protrusion lesions of upper digestive tracts.

目的提高上消化道隆起性病变的诊断及鉴别诊断能力。

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The teeming trillions of bacteria in the digestive tracts of mice have been shown to affect the animals' brain development and behaviour.

BBC: Bacteria in mouse gut affect development and behaviour

In a study published in the Canadian Medical Association Journal, researchers led by Anita Kozyrskyj found that babies born by C-section harbored a different set of microbes in their digestive tracts than those born vaginally, and that infants who were breast-fed had a different recipe of bacteria in their guts than those who were given formula.

CNN: Connection between dirty diapers, childhood health