expanse

n.

广阔的区域；扩张，展开；苍天；

复数：expanses

1. The region of this expanse beyond Earth's atmosphere.
   太空地球大气层以外的空间部分
2. A broad, level, open expanse of land.
   原野，旷野一宽广的、水平的、开阔的土地
3. There was a great expanse of desert before us.
   我们面前有一片广阔的沙漠。
4. The Pacific Ocean is a vast expanse of water.
   太平洋是一片广大的水域。

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