初级市场指发行新证券的市场，之后，证券在二级市场转售或购买。
Primary markets are markets where new issues of securities take place. Any subsequent resale or purchase of such securities is handled on the secondary market.
二级电炮是指利用金属桥箔电爆炸原理驱动二级飞片的装置。
The thesis mainly discusses accelerating process of the first flyer and the optimization design of the second flyer for two-staged electric gun.
二级市场指对已在初级市场发行的证券进行买卖的市场。
The secondary market is where securities are bought and sold once they have been issued in the primary market.
二级防制区，指一级防制区外，符合空气品质标准区域。
Class 2 control regions means areas that meet air quality standards, with the exception of Class 1 control regions.
二级防制区，指一级防制区外，符合空气品质标准区域。
Class 2 control regions means areas that meet air quality standards, with the exception of Class 1 control regions.
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