Some cats munch on grass or other plants, but most biologists agree that such roughage serves only as a digestive aid and provides limited if any nutritional value.
虽然一些猫咀嚼草或其它植物，但是生物学家认为这些粗纤维仅是用来助消化并且提供很有限的营养。
Objective: To explore the value of laparoscopic diagnosis and treatment for lower digestive tract hemorrhage in children.
目的：探讨腹腔镜诊断和治疗儿童下消化道出血的临床价值。
Results In the modalities, barium radiography of upper digestive tract, CT and angiography possess high diagnostic value, however B mode US and X scintigraphy have low diagnostic value.
结果在各种检查中上消化道钡餐造影、CT 和血管造影诊断价值较大，而B超和放射性核素显像的诊断价值较小。
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