The point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected.
天球上,在观测者垂直向下的一点,与天顶完全相对。
the zenith on the imaginary sphere against which celestial bodies appear to be projected.
the van der waals radius of an atom is the radius of an imaginary hard sphere which can be used to model the atom for many purposes.
原子的范德华半径其实是将原子模拟成的硬球体的半径,这种模拟可以解释相当多的问题。
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