You do this slowly to admire the way it changes color, from green to a more milky hue, as it louches, or what happens when the essential oils precipitate out of the solution and release their aromas.

你慢慢地这样做， 欣赏它变色的方式，从绿色到更乳白色的色调，或者当精油从溶液中沉淀出来并释放香气时会发生什么。