Back in 1978, I had to travel between three different campuses in the morning, teaching freshman composition.

1978年时，我每天早上要往返于三个不同的学校，教大一新生写作。

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Three other extrasolar planets believed to be of rocky composition have been reported, but they orbit a pulsar - the flashing corpse of an exploded star - rather than a normal type of star.

之前人们曾报道过另外三颗据信由岩石组成的太阳系外行星，但是，它们是围绕着一颗脉冲星(恒星爆发后遗留的发光的残存物)运转的，而不是一颗常态的恒星。

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The composition is typically three tiered.

这个组成通常有三层。

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The stories come in order of composition, with dates, and in three sections, each of them flagged by a quietly resonant illustration (a view of the planet from outer space, a heavily restored classical fresco, a painting of a spectral cadaver).

NEWYORKER: Laureate of Terror

Joseph De Trani, former head of the National Counterproliferation Center, predicted U.S. intelligence would determine the size and composition of the nuclear device in one to three days based partly on radioactive elements released into the environment.

NPR: NKorean Nuclear Test May Be Intelligence Windfall

In addition to six performances at NYSCI, Maker Space was the site of a three-week education program that introduced 60 Queens middle-schoolers to the fundamentals of music composition through the use of iPads, Lemurs and other digital music-making tools.

FORBES: New York Hall of Science Opens New Maker Space