boundary
英 ['baʊnd(ə)rɪ]
美['baʊndri]
	    - n. 边界;范围;分界线
 
英英释意
- 1. the line or plane indicating the limit or extent of something
 
- 2. a line determining the limits of an area
 
- 3. the greatest possible degree of something;
 - "what he did was beyond the bounds of acceptable behavior"
 - "to the limit of his ability"