它可以由自发分裂的铀原子自然生成。
It can be naturally generated from Uranium atoms that have spontaneously split.
中国经济增长改变了全球能源市场，并使中国消费的每样能源，从石油到铀再到其他自然资源的价格居高不下。
That growth has transformed global energy markets and sustained higher prices for everything from oil to uranium and other natural resources that China has been consuming.
当氦衰变成为氦-3相对于我们在太阳里看到的那它就可用了，因为地球上多数的氦-4是通过元素铀和钍自然放射性衰变而造成的。
What helium is available is depleted in helium-3 relative to what we see in the sun, because most of Earth's helium-4 is freshly made via natural radioactive decay of the elements uranium and thorium.
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