但直到二十世纪初,建筑声学才正式成为一个科学领域。
But it was not until the beginning of the twentieth century that architectural acoustics became a scientific field.
本世纪初,约有三分之一的作物工人年龄在35岁以上。
At the start of this century, about one-third of crop workers were over the age of 35.
自二十世纪初以来,已经有六十多所大学的成员获得过诺贝尔奖。
Since the beginning of the twentieth century, more than sixty university members have won Nobel prizes.
But the question is how are those of us of this generation, living that ethic out in the early 21st century?
但问题是,我们这代人如何,将在21世纪初的生活中体现这一道德?
So he came up with the ideas that led to the idea of Lewis structures in the very early 1900's.
他就提出了这个想法,进而发展出了路易斯结构在二十世纪初。
I've been here in MIT for thirty years, and in the early nineties I taught the large freshmen physics course, and electromagnetism.
我麻省理工工作三十年了,在上世纪九十年代初,我就开始给大一新生上物理课,以及电磁学。
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