have been to  曾经到过

have to have no contrast  有无对比

to have to  得; 只好; 必须

to have to do with  关系

a telephone hot-line has been set up  已设立电话热线

bind to set  连结设定

invex point-to-set mapping0  不变凸点到集映射

invex point-to-set mappings  不变凸点到集映射

meager set=set of first category  瘦集合; 第一范畴集合

piles set into rock  深基础嵌岩灌注桩

point-to-set mapping  点集映射

Set to  调到; 开始认真干

set to work  开始工作

set to zero  归零

Set-set map  集-集映射

set-to  殴斗

to set  规定; 镶嵌; 定

to set a price  定价

to set a record  创记录