Swift and agile, Antarctic fur seals rely on their powerful front flippers to propel them through the water; smaller hind flippers help with steering.

动作灵活而快捷的南极海豹依靠其强大的鳍状前肢，让它们在水中顺利前行；小一些的后鳍帮助控制方向。

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To some extent, the calculation, analysis and results are helpful to the brush seal design and engineering application. These can help the future research in theory and application of brush seals.

本文的计算和分析过程及其结果对于刷式密封的设计和工程应用有一定的指导意义，为进一步深入开展刷式密封的理论研究和提高应用水平奠定了良好的基础。

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When you bleed, your blood's clotting cells, called platelets, build up at the site of your wound. The platelets help form a plug that seals the opening in your blood vessel to stop bleeding.

当你出血时，血液中的凝血细胞，也即血小板会聚集到你的伤口部位，形成一个塞子封住你的血管来止血。

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First of all, I could not help but notice a lot of the people clutching their toy seals were wearing leather shoes.

ECONOMIST: European politics

While the models were first cast and the paint was first mixed in New Jersey, the actual balloon was manufactured in Sioux Falls, South Dakota, with the help of a 3-D scanning program and a special machine that seals urethane panels.

WSJ: Up in the Air | Making It