1. The leaves of the plant were coated in a thin layer of pruina.
这种植物的叶子上涂有一层薄薄的白色粉末。

2. The wings of some butterflies have a beautiful pruina that glistens in the sunlight.
一些蝴蝶的翅膀上有着在阳光下闪烁的美丽的白色粉末。