n.

1. 伞，雨伞
   She sat under a striped umbrella.

   她坐在一把条纹伞下。

2. 保护伞，庇护
   The new country was formed under the political umbrella of the United Nations.

   这一新国家是在联合国的政治保护下建立起来的。

3. 防空火网
4. （包含许多组成部分的）伞形结构；网

n.

1. a device consisting of a circular fabric canopy on a folding metal frame supported by a central rod, used as protection against rain.
2. a protecting force or influence.
   ▸a screen of fighter aircraft or anti-aircraft artillery.
3. [usu. as modifier] a thing that includes or contains many different parts:
   an umbrella organization.
4. Zoology  the gelatinous disc of a jellyfish, which it contracts and expands to move through the water.