ruler[英][ˈru:lə(r)][美][ˈrulɚ]
n.尺; 直尺; 统治者;
复数：rulers
例句:
1.
Did tribes voluntarily delegate authority to a powerful ruler?
部落会自愿将权力转交给强大的统治者吗？
2.
The type of laser used to make the comb is critical to the precision of the ruler.
用来产生光学频率梳的激光的类型对于此频率尺的精度至关重要。
3.
But the libyan ruler has other options.
不过利比亚的统治者还有其他的选择。
