阴阳在《 周易 》主要不是两种气体, 而是隐显或幽明.Yin and Yang in Zhouyi were not two kinds of gases, but appearing or dimness & brightness ....

“隐显”的拼音为：yǐn xiǎn...

“隐显”的英语可以翻译为：disappearing，invisible ...