我是 Go 語言的新手，正在嘗試學習它，所以請原諒任何明顯的問題，但需要一些幫助。問題：我試圖僅過濾 DetectEntitiesOutput 中 Comprehend 返回的組織實體。我的進口如下    "errors"    "fmt"    "strings"    "github.com/aws/aws-lambda-go/lambda"    "github.com/aws/aws-sdk-go/aws"    "github.com/aws/aws-sdk-go/aws/session"    "github.com/aws/aws-sdk-go/service/comprehend"    func Filter(vs []Entity, f func(Entity) bool) []Entity {    vsf := make([]Entity, 0)    for _, v := range vs {    if f(v) {    vsf = append(vsf, v)    }    }    return vsf    }    func isOrg(vs Entity) bool {    return strings.EqualFold(Entity.Type, "ORGANIZATION")    }```But i am getting following error ./main.go:52:18: undefined: Entity./main.go:53:16: undefined: Entity./main.go:62:15: undefined: Entity./main.go:63:27: undefined: EntityCan someone help?