n.
a line determining the limits of an area
同义词:boundaryedge
the line or plane indicating the limit or extent of something
同义词:boundarybounds
the greatest possible degree of something
"what he did was beyond the bounds of acceptable behavior"
同义词:limitboundary
a light, self-propelled movement upwards or forwards
同义词:leapleapingspringsaltationbounce