Then from the equations of the matrix elements the equation of the usual two composite boson is separated, as it is a three-dimensional equation, the ghost states disappear.

而后由矩阵元方程分离出通常两个复合玻色粒子满足的等时方程，它是一个三维方程，因此无鬼态。

youdao

The United States has thousands of "ghost towns."

VOA: special.2010.02.15