Experimental infection of 3-week old piglets by intraperitoneal route induced typical polyserositis.
实验感染三周龄仔猪，腹腔内接种能诱发典型的多发性浆膜炎。
Children under six years old may eat half of a can (3 oz) of chunk light tuna per week.
六岁以下的儿童每周可以吃半罐(3盎司)大块鲔鱼。
Methods: Chondrocytes were isolated from articular cartilages of 3 week old rabbits and formed cartilages by cultivation in centrifuge tubes for 2 weeks.
方法：自3周龄兔关节软骨分离软骨细胞，经离心管培养2周形成软骨。
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