Unlike helium-4, it cannot be produced by radioactive decay.
与氦- 4不同之处是，氦- 3不能由放射性衰变产生。
Because of this, the quality of helium-4 nucleus has been reduced.
正因为这样，氦4原子核的质量减少了。
Like deuterium, it is rare relative to helium-4, but, unlike hydrogen, helium doesn't form chemical compounds as abundant as water.
象氘一样，相对于氦- 4它是非常罕见的，但是不同于氢，氦不是来自化学混合物象水那样丰富。
Helium-3 has one less neutron than regular helium (helium-4) and is also produced in the sun and almost as quickly consumed in fusion reactions as deuterium.
氦- 3比普通氦(氦- 4)少一个中子，并且同样在太阳里产生然后象氘一样在核聚变中迅速被消耗掉。
Unlike fermions, there is no limit to the number of bosons that can occupy the same quantum state, a behaviour that gives rise to the superfluidity of helium-4.
玻色子与费米子不同，占有同一量子态的玻色子数目不受限制，这一性状引发氦-4的超流性。
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.
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。
Unlike helium - 4, it cannot be produced by radioactive decay.
与氦- 4不同之处是，氦- 3不能由放射性衰变产生。
Unlike helium - 4, it cannot be produced by radioactive decay.
与氦- 4不同之处是，氦- 3不能由放射性衰变产生。
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