A key component of an air-launched missile defense system demonstrated its ability to acquire and track a ballistic missile target in the boost phase, according to Raytheon.

日前，一种空射导弹防御系统的关键组成部分成功演示了对助推段弹道导弹的截获与跟踪能力。

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Defense companies submitted their proposals for the first phase of GCV in late May.

防务公司在5月下旬提交了GCV第一阶段的的建议。

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Wool and graduate student Ohad Ben-Cohen designed their two-phase program as a new line of defense for the Linux operating system.

Wool教授和研究生Ohad Ben - Cohen设计的两阶段程序作为防护Linux操作系统的一个新方向。

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The last phase of the new missile defense plan, to be ready by 2020, would be to develop interceptors with the capability of blocking long-range Iranian missiles aimed at the United States.

VOA: standard.2009.09.17

The defense phase is expected to be no longer than a month.

CNN: Prosecutors rest case in embassy bombings trial

And what - we can't leave out the terminal phase of missile defense, which is things like PAC-3, the Patriot Missile System, and the Terminal High Altitude Area Defense or THAAD, which would shoot down on a threat missile in the final phase of its flight.

NPR: Missile Defense, the U.S. and Europe

And then something that they would call the boost-phase missile defense, which would be ways of shooting down missiles when they're at their sort of most vulnerable phase of flight.

NPR: Missile Defense, the U.S. and Europe