covering

覆盖物、罩子、套子

She put a plastic covering over the sofa before painting.

她在油漆前给沙发盖上了一层塑胶罩。

外皮、表层、外壳

The seeds have a hard outer covering that resists water.

这些种子有一层坚硬的外皮，可以防水。

覆盖、遮盖、铺盖

A light covering of snow appeared on the hills overnight.

一夜之间山丘上铺了一层薄雪。

掩护的、遮掩的

The squad advanced under covering fire from the rooftop.

小队在屋顶的掩护火力下向前推进。

随附的、附函的英式

Send a covering letter with your application form.

请在申请表中附上一封说明信。