NASA plans to launch an unmanned Orion aboard a Delta IV booster in 2014 as part of a flight test.

NASA计划在2014年发射无人乘坐德尔塔iv助推器猎户座作为一个试飞的一部分。

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The Delta IV Heavy is the largest of the Delta series, packing the punch of three rocket boosters instead of the usual one.

Delta 4型重型运载火箭是Delta系列中最庞大的，它配备了三支火箭推进器，而一般型号只有一支。

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The Delta IV Heavy is the largest of the Delta series, packing the punch of three rocket boosters instead of the usual one.

Delta IV重型运载火箭是Delta系列中最大的，配备三个助推火箭。

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Then you get successively deeper, II through IV, slow, irregular, high amplitude delta waves, and then once you reach stage IV you start going up again, up through stage III and II.

然后睡得越来越深，从第二到第四阶段，慢，不规则，高振幅的δ波，等你到达第四阶段，你又开始返回，第三阶段和第二阶段。

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The Delta IV is operated by a joint venture between Lockheed Martin and Boeing Co.

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To do that would require a Delta IV Heavy launch vehicle with a stack of two Star 48A engines.

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Congress has adopted language strongly favoring space-shuttle derived rockets for this purpose, rather than a version of the Delta IV.

WSJ: Lockheed Martin Sees Space Capsule Test Flight in 2013