diff --git a/bench/http.go b/bench/http.go
index f9a03c7..8a6a470 100644
--- a/bench/http.go
+++ b/bench/http.go
@@ -21,9 +21,9 @@ import (
 	"github.com/yedf/dtm/examples"
 )
 
-// 启动命令：go run app/main.go qs
+// launch command：go run app/main.go qs
 
-// 事务参与者的服务地址
+// service address of the transcation
 const benchAPI = "/api/busi_bench"
 const benchPort = 8083
 const total = 200000
diff --git a/dtmcli/dtmimp/db_special.go b/dtmcli/dtmimp/db_special.go
index d45f460..b4db7fc 100644
--- a/dtmcli/dtmimp/db_special.go
+++ b/dtmcli/dtmimp/db_special.go
@@ -41,10 +41,6 @@ func init() {
 
 type postgresDBSpecial struct{}
 
-func (*postgresDBSpecial) TimestampAdd(second int) string {
-	return fmt.Sprintf("current_timestamp + interval '%d second'", second)
-}
-
 func (*postgresDBSpecial) GetXaSQL(command string, xid string) string {
 	return map[string]string{
 		"end":      "",