这句是什么意思?“The opening time of pubs is set by law.”谢谢

这句是什么意思?“The opening time of pubs is set by law.”谢谢
金山词霸翻译的set by是
set by [简明英汉词典]
v.把...留开
这是动词,怎么跟is后面还用set by原型啊?不是如果要用动词也应该是ing形式么?seting by?