过去我的老师们总是用价格贵还容易把手弄脏的钢笔亲手写出他们的著作和论文的手稿，系里的秘书们再利用暑假的时间用打字机把这些手稿打出来。
My teachers used to write out the drafts of their books and papers by hand, with expensive, though smudgy, fountain pens, and the departmental secretaries would type them up over the summer break.
从宇宙大爆炸起到太阳系诞生，已经过去了大约2年时间。
Is born from the universe large explosion to solar system, had already passed for about 2 years.
也就是说从宇宙大爆炸起到太阳系诞生，已经过去了大约2年时间。
That is born from the universe large explosion to solar system, had already passed for about 2 years.
也就是说从宇宙大爆炸起到太阳系诞生，已经过去了大约2年时间。
That is born from the universe large explosion to solar system, had already passed for about 2 years.
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