引起政策变化的原因是多方面的，但主要出于防务的需要。

The changes in commercial policies resulted from various factors, but mainly from the need for defense.

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尽管2010年与中国的军事关系不妙，但中美防务的关系似乎在改进中。

Although 2010 was a difficult year for military relations with China, Sino-American defense ties appear to be on the mend.

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但是，这种增长的62%归因于防务和非防务的本土安全，而他们都正在放慢了速度。

But 62% of this growth was attributable to defense and non-defense homeland security, which are decelerating.

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