n. a measuring instrument for measuring and indicating a quantity such as the thickness of wire or the amount of rain etc.
n. accepted or approved instance or example of a quantity or quality against which others are judged or measured or compared
n. the distance between the rails of a railway or between the wheels of a train
n. the thickness of wire
n. 标准度量, 计量器
vt. 精确计量, 估计
[计] 线规