The PLA Navy will need to overcome several large obstacles before it can field an operational aircraft carrier and associated supporting ships.

海军将需要克服一些障碍，才能场大型航空母舰及相关业务辅助舰艇。

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"There was no information that indicated where troops were or ships were, " he told the Associated Press news agency.

BBC: Canadian Jeffrey Delisle guilty of spying for Russia

While this is a significant sum, to be sure, if an apples- to-apples comparison were made, the price of purchasing and operating modern fighter aircraft wings or a class of surface ships or submarines would significantly exceed that associated with a ground-based NMD system.

CENTERFORSECURITYPOLICY: Sea-Based Missile Defenses -- for the Allies, for the U.S.