diff --git a/alien_invasion.py b/alien_invasion.py
index 52394e3..2faf83f 100644
--- a/alien_invasion.py
+++ b/alien_invasion.py
@@ -1,49 +1,49 @@
-import pygame
-from game_stats import GameStats
-from settings import Settings
-from ship import Ship
-import game_functions as gf
-from pygame.sprite import Group
-from alien import *
-from button import Play_Button
-from bullet import *
-from scoreboard import Scoreboard
-
-
-def run_game():
-    # 创建窗体
-    pygame.init()
-    ai_settings = Settings()
-    screen = pygame.display.set_mode((ai_settings.screen_width, ai_settings.screen_height))
-    pygame.display.set_caption("Alien Invasion")
-
-    # 创建一艘飞船，一个子弹编组和一个外星人编组
-    ship = Ship(ai_settings, screen)
-    bullets = Group()
-    alien = Alien(ai_settings, screen)
-    aliens = Group()
-    bossalien = BossAlien(ai_settings, screen)
-    bossbullet = BossBullet(ai_settings, screen, bossalien)
-
-    # 创建外星人群
-    gf.create_fleet(ai_settings, screen, ship, aliens)
-
-    # 创建存储游戏统计信息的实例，并创建记分牌
-    stats = GameStats(ai_settings)
-    sb = Scoreboard(ai_settings, screen, stats)
-
-    # 创建Play按钮
-    play_button = Play_Button(ai_settings, screen, "play")
-    
-    # 开始游戏主循环
-    while True:
-        gf.check_events(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets)
-        if stats.game_active:
-            ship.update  # 更新飞船
-            gf.update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets, bossalien, bossbullet)  # 更新子弹
-            gf.update_aliens(ai_settings, screen, stats, sb, ship, aliens, bullets, bossalien, bossbullet)  # 更新外星人
-        gf.update_screen(ai_settings, screen, stats, sb, ship, aliens, bossalien, bullets, bossbullet,
-                         play_button)  # 更新屏幕
-
-
-run_game()
+import pygame
+from game_stats import GameStats
+from settings import Settings
+from ship import Ship
+import game_functions as gf
+from pygame.sprite import Group
+from alien import *
+from button import Play_Button
+from bullet import *
+from scoreboard import Scoreboard
+
+
+def run_game():
+    # 创建窗体
+    pygame.init()
+    ai_settings = Settings()
+    screen = pygame.display.set_mode((ai_settings.screen_width, ai_settings.screen_height))
+    pygame.display.set_caption("Alien Invasion")
+
+    # 创建一艘飞船，一个子弹编组和一个外星人编组
+    ship = Ship(ai_settings, screen)
+    bullets = Group()
+    alien = Alien(ai_settings, screen)
+    aliens = Group()
+    bossalien = BossAlien(ai_settings, screen)
+    bossbullet = BossBullet(ai_settings, screen, bossalien)
+
+    # 创建外星人群
+    gf.create_fleet(ai_settings, screen, ship, aliens)
+
+    # 创建存储游戏统计信息的实例，并创建记分牌
+    stats = GameStats(ai_settings)  # 数据统计
+    sb = Scoreboard(ai_settings, screen, stats)  # 记分牌
+
+    # 创建Play按钮
+    play_button = Play_Button(ai_settings, screen, "play")
+    
+    # 开始游戏主循环
+    while True:
+        gf.check_events(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets)
+        if stats.game_active:
+            ship.update  # 更新飞船
+            gf.update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets, bossalien, bossbullet)  # 更新子弹
+            gf.update_aliens(ai_settings, screen, stats, sb, ship, aliens, bullets, bossalien, bossbullet)  # 更新外星人
+        gf.update_screen(ai_settings, screen, stats, sb, ship, aliens, bossalien, bullets, bossbullet,
+                         play_button)  # 更新屏幕
+
+
+run_game()