n. 边界, 范围, 限度, 界限

n the line or plane indicating the limit or extent of something

n a line determining the limits of an area

n the line or plane indicating the limit or extent of something

n the greatest possible degree of something

n a light, self-propelled movement upwards or forwards

v move forward by leaps and bounds

v form the boundary of; be contiguous to

v place limits on (extent or access)

v spring back; spring away from an impact