Objective To observe the morphologic characteristics of myocardial sleeve in sheep~(, ) s pulmonary veins to provide data for the model of ectopic atrial fibrillation.
目的观察山羊肺静脉心肌袖的形态特征，为异位房颤动物模型提供形态资料。
The Series 200 engines were a ball bearing designs whereas the earlier Series 100's were plain sleeve bearing engines.
一系列200引擎一球轴承设计，而较早前的100系列的平原套轴承的引擎。
The Series 200 engines were a ball bearing designs whereas the earlier Series 100's were plain sleeve bearing engines.
一系列200引擎一球轴承设计，而较早前的100系列的平原套轴承的引擎。
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