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並前往https://www.khanacademy.org/science/in-in-class-11-biology-india/x9d1157914247c627:digestion-and-absorption/x9d1157914247c627:parts-of-the-digestive-system/v/small-intestine-part-1

Small intestine 1: Structure (video) | Khan Academy

The GI tract is only made up of the stomach and intestines through which food travels. The digestive system also includes organs that help with digestion, ...

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