expanse
英 [ɪk'spæns; ek-]
美[ɪk'spæns]
	    - n. 宽阔;广阔的区域;苍天;膨胀扩张
 
英英释意
- 1. a wide scope;
 - "the sweep of the plains"
 
- 2. the extent of a 2-dimensional surface enclosed within a boundary;
 - "the area of a rectangle"
 - "it was about 500 square feet in area"
 
- 3. a wide and open space or area as of surface or land or sky