第四等级或次序的。
Of fourth rank or order.
指包含例如x4的数学表达式的。
Of a mathematical expression containing e.g. x4.
与四进制有关的或采用四进制的。
Relating to or in number base four.
季铵。
quaternary ammonium.
由四种元素组成的。
Composed of four elements.
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