磁单极 meaning in English

magnetic monopole

A search for magnetic monopoles has been going on ever since dirac .
从狄拉克以来，对磁单极子的探索却一直没有停止。
There are other particles proposed to exist , but have not been found in experiment . magnetic monopole is one of them
科学家猜想还有其他基本粒子存在，但实验一直未能找到证据，磁单极子就是其中一种。
If the theory is correct , magnetic monopole not only exist , a lot of them should have been created at the beginning of the universe . why cannot we find one is still a mystery in cosmology
如果理论是正确的话，磁单极子不但存在，而且在宇宙的初期，还产生了很多磁单极子，但为什么到今天我们仍然一粒也找不到，这实在是宇宙学的一个难题。