对于去哪个采集区去找是没有限制的，但是不管是什么颜色的，每次只要卡被拿出来就必须交到屋子里的聚集点处。

There were no restrictions on which patches to visit, but each time a card was plucked it had to be returned to the home base, irrespective of colour.

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目的研究脂膜微囊向脑损伤位点靶向性聚集的特点，探讨其向鼠脑损伤区靶向性聚集的机制。

Objective To investigate the affinity of lipid-coated microbubbles (LCMs) for an injured site in rat brain, and discuss the mechanism of LCM targeting brain lesions.

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