The challenge of double even multiple challenges of safety and operation.

双倍甚至多倍复杂的安全、运营方面的挑战.

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Small intestinal tumor is rare even multiple adenocarinomas limited to the small intestine are extremely uncommon.

小肠肿瘤非常少见,而多发性小肠腺癌更是极端不平常.

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