Slightly belying its name, the fine-structure constant is actually a compound of several other physical constants, whose values can found in any physics textbook.
And it says that the divergence of the electric field is equal to, so this is a just a physicalconstant, and what it is equal to depends on what units you are using.
它说的是，电场的散度等于，这是一个物理常数，它等于什么，是基于所用的单位。
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This paper analyses the physicalconstant constructing by dimensional method and introduces the important mean of dimension of quantity in physicalconstant constructing.