diff --git a/main.go b/main.go
index 958f4ee..bd9a704 100644
--- a/main.go
+++ b/main.go
@@ -7,7 +7,7 @@ import (
 
 var (
 	// Translate
-	translator Translator
+	translator = NewTranslator()
 	// UI
 	app            = tview.NewApplication()
 	src_box        = tview.NewTextArea()
diff --git a/translator.go b/translator.go
index 8d36d4e..bfa77d9 100644
--- a/translator.go
+++ b/translator.go
@@ -13,13 +13,20 @@ import (
 )
 
 const (
-	textURL   = "https://translate.googleapis.com/translate_a/single?client=gtx&sl=%s&tl=%s&dt=t&q=%s"
+	textURL  = "https://translate.googleapis.com/translate_a/single?client=gtx&sl=%s&tl=%s&dt=t&q=%s"
 	soundURL = "https://translate.google.com.vn/translate_tts?ie=UTF-8&q=%s&tl=%s&client=tw-ob"
 )
 
 type Translator struct {
-	srcLang string
-	dstLang string
+	srcLang   string
+	dstLang   string
+	soundLock *Lock
+}
+
+func NewTranslator() Translator {
+	return Translator{
+		soundLock: NewLock(),
+	}
 }
 
 func (t Translator) Translate(message string) (string, error) {
diff --git a/utils.go b/utils.go
index 46ae5a1..94aa536 100644
--- a/utils.go
+++ b/utils.go
@@ -10,5 +10,27 @@ func IndexOf(candidate string, arr []string) int {
 }
 
 func SetTermTitle(title string) {
-	print("\033]0;" , title , "\007")
+	print("\033]0;", title, "\007")
+}
+
+type Lock struct {
+	stop        bool
+	threadCount int8
+}
+
+func NewLock() *Lock {
+	return &Lock{
+		stop:        true,
+		threadCount: 0,
+	}
+}
+
+func (l *Lock) Aquire() {
+	l.stop = false
+	l.threadCount++
+}
+
+func (l *Lock) Release() {
+	l.stop = true
+	l.threadCount--
 }