为什么在版本声明后没有等号“ =”

Question

在aws_s3_bucket的声明中，缺少等号"="的是版本控制：

 resource "aws_s3_bucket" "b" {
    bucket                      = "bucket1"
     region                      = "us-west-02"
     tags                        = {
         "Evironment" = "dev"
         "Name"       = "bucket1"
       }
     versioning {
         enabled    = yes
       }
   }