Polyester fibers are white and can vary from luster and semi-translucent to dull and opaque depending on the amount of the lustrant added to the polymer.

聚酯纤维呈白色，它可以是有光泽的、半透明的。聚酯纤维的光泽取决于所加入光泽剂的量。

youdao

Oxidation of the skin causes it to appear dull. Vitamin E improves the appearance of the skin by adding color and luster to the skin.

氧化作用的伤害， 会使皮肤变得暗沉； 维他命E 可以带给皮肤色彩与光泽， 改善肤质。

youdao

In 1990, when GM initially invested in Saab, the thinking was that GM could help improve Saab's quality and overall refinement, while the Swedish brand would add some luster to GM's generally dull product portfolio.

CNN: The fate of four GM brands