Nearly half of all first births in the US now take place outside marriage, according to a new study.
根据一项新的研究称，美国将近一半的第一胎发生于婚外情。
The second half of the book turns in somewhat different, certainly equally important directions, but would take us much more time than the time we have allotted to deal with.
巨著的后半篇幅，转向不同，但绝对同等重要的方向，可所需花费的时间，将远超过我们课堂所订的时间。
If we could stay as vigorous as we are at 12, it would take about 700 years for half of us to die, and another 700 for the survivors to be reduced by half again.
假如我们能保持12岁时的旺盛生命力，那么我们当中的一半人过700年才会死去，剩下的一半人再过700年，才会又减少一半。
It is said that spaceships can travel at half the speed of light by 2100. It might take us two or three days to get to Mars. Can you imagine humans' life on Mars?
据说宇宙飞船到2100年飞行速度可达光速的一半，这样的话，我们只要两三天就能到达火星，但你能想象人类真能在火星上住吗？
It is said that spaceships can travel at half the speed of light by 2100. It might take us two or three days to get to Mars. Can you imagine humans' life on Mars?
据说宇宙飞船到2100年飞行速度可达光速的一半，这样的话，我们只要两三天就能到达火星，但你能想象人类真能在火星上住吗？
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