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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By just knowing three chords, the I, IV and V7, you can play thousands of songs.

只要知道三个和弦：i, IV和V7，你就可以弹奏成千上万的歌曲。

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Now we're going to hear Beach Boys, IV I guess,with a three-chord chord progression and it's going to be sub-dominant , V dominant , I tonic .

而现在我们来听听貌似是沙滩男孩，三和弦进行，然后将会是次属音，属音，和主音。

耶鲁公开课 - 聆听音乐课程节选

The New Deal was introduced after five years of solid economic growth, whereas Hartz IV arrives after three years of stagnation.

ECONOMIST: Ersatz Europeans

The two new entries in the box office chart saw last weekend's number one, the horror movie Saw IV, drop to number three.

BBC: RELATED BBC SITES

That the new regulations will only disqualify a college from funding its operations through Title IV federal dollars if it fails to meet the new benchmarks in three out of four years means it probably will not be too difficult to game the system although the Department did craft other restrictions that will curb some egregious behavior.

FORBES: New Higher Ed Regulations Leave Everyone Empty