Ten you have nine dreams be very rare.
十年九不遇,十梦九有你。
After the age of eight the opportunities are going to be very rare.
八岁以后,这种机会就会逐渐减少。
This practice is thought to be very rare in the United States or other wealthy nations.
这种惯例在美国或其它富裕国家是很少见的。
So I said before when we were talking about single atoms, we always define the zero energy as when an electron was actually ejected, but now, when we talk about chemical reactions taking place, it's very, very rare that we're actually going to be talking about anything that gets to this point here.
我之前说过,当我们讨论单个原子的时候,我们总是把零点能,定在电子被发射出去以后,但是现在,当我们讨论化学反应发生的时候,非常非常罕见出现,确实达到,这种程度的情况。
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