diff --git a/component.go b/component.go
index fe302a4..da121d1 100644
--- a/component.go
+++ b/component.go
@@ -1,6 +1,8 @@
 package ecs
 
 import (
+	"fmt"
+
 	"github.com/yohamta/donburi"
 )
 
@@ -18,28 +20,28 @@ func (c *ComponentType[T]) Set(entry *Entry, component *T) {
 	c.ComponentType.Set(entry.Entry, component)
 }
 
-// // Each iterates over the entities that have the component.
-// func (c *ComponentType[T]) Each(w World, callback func(*Entry)) {
-// 	c.ComponentType.Each(w.(*world).world, func(entry *donburi.Entry) {
-// 		callback(&Entry{Entry: entry})
-// 	})
-// }
+// Each iterates over the entities that have the component.
+func (c *ComponentType[T]) Each(w World, callback func(*Entry)) {
+	c.ComponentType.Each(w.(*world).world, func(entry *donburi.Entry) {
+		callback(&Entry{Entry: entry})
+	})
+}
 
-// // First returns the first entity that has the component.
-// func (c *ComponentType[T]) First(w World) (*Entry, bool) {
-// 	entry, ok := c.ComponentType.First(w.(*world).world)
-// 	return &Entry{entry}, ok
-// }
+// First returns the first entity that has the component.
+func (c *ComponentType[T]) First(w World) (*Entry, bool) {
+	entry, ok := c.ComponentType.First(w.(*world).world)
+	return &Entry{entry}, ok
+}
 
-// // MustFirst returns the first entity that has the component or panics.
-// func (c *ComponentType[T]) MustFirst(w World) *Entry {
-// 	e, ok := c.First(w)
-// 	if !ok {
-// 		panic(fmt.Sprintf("no entity has the component %s", c.ComponentType.Name()))
-// 	}
+// MustFirst returns the first entity that has the component or panics.
+func (c *ComponentType[T]) MustFirst(w World) *Entry {
+	e, ok := c.First(w)
+	if !ok {
+		panic(fmt.Sprintf("no entity has the component %s", c.ComponentType.Name()))
+	}
 
-// 	return e
-// }
+	return e
+}
 
 // SetValue sets the value of the component.
 func (c *ComponentType[T]) SetValue(entry *Entry, value T) {
diff --git a/examples/rtss-event/main.go b/examples/rtss-event/main.go
index 507c890..db621c5 100644
--- a/examples/rtss-event/main.go
+++ b/examples/rtss-event/main.go
@@ -23,6 +23,7 @@ func (me *SwitchSystem) WhenFireSwitchDcEvent(w ecs.World, event FireSwitchDcEve
 func (me *SwitchSystem) Update(w ecs.World) {
 	me.count += 1
 	fmt.Println("time: ", time.Now().Format(time.StampMilli), "====>>>world-", w.Id(), " SwitchSystem update , count: ", me.count)
+	fireSwitchDcEventType.Publish(w, &FireSwitchDcEvent{Dc: true})
 }
 
 // var switchSystem = &SwitchSystem{}
@@ -34,8 +35,8 @@ func NewSwitchSystem() *SwitchSystem {
 }
 
 var (
-	wd1 = ecs.NewWorld(500)
-	wd2 = ecs.NewWorld(500)
+	wd1 = ecs.NewWorld(20)
+	wd2 = ecs.NewWorld(20)
 )
 
 // ////////////////////////////////////////
@@ -43,7 +44,6 @@ func main() {
 	go world1()
 	go world2()
 	time.Sleep(4 * time.Second)
-	fireSwitchDcEventType.Publish(wd1, &FireSwitchDcEvent{Dc: true})
 	fireSwitchDcEventType.Publish(wd2, &FireSwitchDcEvent{Dc: false})
 }
 func world1() {
@@ -57,7 +57,7 @@ func world1() {
 	//
 	time.Sleep(3 * time.Second)
 	//
-	fireSwitchDcEventType.Publish(world, &FireSwitchDcEvent{Dc: true})
+
 	fireSwitchDcEventType.Publish(world, &FireSwitchDcEvent{Dc: false})
 	time.Sleep(10 * time.Second)
 }
@@ -71,7 +71,6 @@ func world2() {
 	//
 	time.Sleep(3 * time.Second)
 	//
-	fireSwitchDcEventType.Publish(world, &FireSwitchDcEvent{Dc: true})
 	fireSwitchDcEventType.Publish(world, &FireSwitchDcEvent{Dc: false})
 	time.Sleep(10 * time.Second)
 }
diff --git a/world.go b/world.go
index f7b841a..8900437 100644
--- a/world.go
+++ b/world.go
@@ -72,13 +72,19 @@ type world struct {
 	toBeExecuteds chan ExecuteFunc
 }
 
+// 新建一个组件类型
 func NewComponentType[T any](opts ...interface{}) *ComponentType[T] {
 	ct := donburi.NewComponentType[T](opts...)
 	return &ComponentType[T]{ct}
 }
 
+// 新建一个标签
+func NewTag() *ComponentType[struct{}] {
+	return NewComponentType[struct{}]()
+}
+
 // 初始化一个新World
-// tick 单位为ms，且必须大于0
+// tick 单位为ms，且必须大于0,(小于15ms的值在Windows系统中会达不到，Windows系统中系统中断好像默认是15.6ms，也就是一秒最多64次)
 func NewWorld(tick int) World {
 	return &world{
 		world:         donburi.NewWorld(),
@@ -188,8 +194,8 @@ func (w *world) Close() {
 	w.quit <- struct{}{}
 }
 
-// 事件管理相关处理
-func (w *world) processManageEventFuncs() {
+// 执行待处理方法
+func (w *world) executeTodos() {
 	manageEventChan := w.toBeExecuteds
 	for {
 		select {
@@ -200,9 +206,7 @@ func (w *world) processManageEventFuncs() {
 		default:
 			return
 		}
-
 	}
-
 }
 func (w *world) run() {
 	for {
@@ -232,7 +236,7 @@ func (w *world) run() {
 					sys.Update(w)
 				}
 				// 处理事件管理相关
-				w.processManageEventFuncs()
+				w.executeTodos()
 				// 处理所有事件
 				processAllEvents(w)
 			}