| 单词 | give-and-take lines | 
| 释义 | give-and-take lines [¦giv ǝn `tāk ´līnz]  MATHEMATICS Straight lines which are used to approximate the boundary of an irregular, curvilinear figure for the purpose of approximating its area; they are placed so that small portions excluded from the area under consideration are balanced by other small portions outside the boundary.  | 
	
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