在今年二月份时,有多名天文学家都警告称,人类现在要比历史的任何一个时候都更加脆弱,面对太阳风暴,我们必须做好万全准备,以应对这一场全球性的卡特里娜飓风灾难。
In February, astronomers warned that mankind is now more vulnerable to such an event than at any time in history - and that the planet should prepare for a global Hurricane Katrina-style disaster.
亲爱的,任何时候你想要一个临时照看孩子的人,只要开口说就是了。
那并不是一个始终温暖的时期,因为在那时跟大冰期以来的任何时候都一样,降雨量和温度都在不断变化。
It was not a time of uniform warmth, for then, as always since the Great Ice Age, there were constant shifts in rainfall and temperature.
One peculiar property of this--incidentally, at every point of time this thing holds, this is time to maturity.
顺便说一下这个公式一个特别的性质,这个等式在任何时候都成立,这是贷款剩余期限
It's a common mistake to make if you forget that I've actually declared that variable up top, but wait a minute, I know any time that I use a variable, I have to declare it.
这是一个通常犯的错误,如果你忘了,之前在前面已经声明了这个变量,等等,我知道在任何时候,我使用一个变量,我必须声明它。
So it's very important to be keeping in mind that any time you see a double bond, you have a pi bond there, so you're not going to see any rotation around the bond axis.
所以你们要记住,任何时候你们看到一个双键,这里面有π键,你们不会看到关于键轴的任何转动。
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