The root of the liquorice plant is often used to make sweeteners.

liquorice 是名词，指"甘草"这种植物。这个词源自希腊语"glykyrrhiza"，由"glykys"（甜的）和"rhiza"（根）组成，字面意思是"甜根"，准确描述了甘草根部甜味的特性。