1. These two properties make
opalescent film an obvious material for currency.
这两种特性使得这种乳白色薄膜成为制造纸钞的绝好材料。
3. an iridescent oil slick; nacreous (or pearlescent) clouds looking like mother-of-pearl; a milky
opalescent (or opaline) luster.
彩色的浮油;看起来像珍珠母一样光芒四射的云彩;乳白色的、像珍珠一样的光泽。