three x plus four y is z
或:three x plus four y makes z
或:three x plus four y equals z
或:three x plus four y is equal to z
毫摩每升 Millimole per litre
three x plus four y is z
或:three x plus four y makes z
或:three x plus four y equals z
或:three x plus four y is equal to z
毫摩每升 Millimole per litre