n the complete duration of something
n the distance or interval between two points
n two items of the same kind
n a unit of length based on the width of the expanded human hand (usually taken as 9 inches)
n a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.
n the act of sitting or standing astride
v to cover or extend over an area or time period
n. 跨度( span的名词复数 ); 持续时间; 一段时间; （五指张开时的）指距