1. The Sahara is a vast expanse of desert.
    撒哈拉是一片广袤无垠的沙漠。

2. A vast expanse of rice fields was laid out before us.
    大片稻田展现在我们面前。

1. 宽阔：expanding 展开的 | expanse 宽阔 | expansibility 扩展性

2. expanse

2. 广阔：frontier 邊緣地帶 | expanse 廣闊 | seagoing 遠洋航行的

3. 膨胀：expandtubes 胀管 | expanse 膨胀 | expansibility 膨胀率 膨胀性 胀度

4. 广阔;浩渺;太空;膨胀：expanding-spread vertical-loop technique 展开排列垂直回路技术 | expanse 广阔;浩渺;太空;膨胀 | expansibility 膨胀性

1. 广袤;辽阔;浩瀚
    An expanse of something, usually sea, sky, or land, is a very large amount of it.

danci.911cha.com

    e.g. ...a vast expanse of grassland.
           广阔的草原

1. a wide scope

    e.g. the sweep of the plains

    Synonym: sweep

2. the extent of a 2-dimensional surface enclosed within a boundary

    e.g. the area of a rectangle
           it was about 500 square feet in area

    Synonym: areasurface area

3. a wide and open space or area as of surface or land or sky