二次开发系统
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autocad second development system autocad二次开发系统
second development system
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Mr. Hagel also outlined a series of upgrades under development, including plans to install a second advanced radar system in Japan to more quickly detect North Korean missile launches.
WSJ: U.S. to Boost Missile Defenses in Response to North Korea
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