number of terms 项数
vertices 顶点
coordinates 坐标
H horizontal rows and W vertical columns H个水平行和W个竖直列
Consider performing the following operation 请考虑如下操作
the remainder when A is divided by B 当A被B整除后的余数
lowercase English letters 小写英文字母
install zero or more surveillance cameras at the intersections 在路口装摄像头
an isosceles trapezoid 一个等腰梯形
omit 省略