diff --git a/src/NetHack_3.7/src/ball.c b/src/NetHack_3.7/src/ball.c
index 31231fe..bb01698 100644
--- a/src/NetHack_3.7/src/ball.c
+++ b/src/NetHack_3.7/src/ball.c
@@ -19,25 +19,34 @@ static int bcrestriction = 0;
 static struct breadcrumbs bcpbreadcrumbs = {0}, bcubreadcrumbs = {0};
 #endif
 
-void
-ballrelease(boolean showmsg)
+void ballrelease(boolean showmsg)
 {
     if (carried(uball) && !welded(uball)) {
+        // 如果玩家正在携带铁球并且未被焊接
         if (showmsg)
             pline("Startled, you drop the iron ball.");
+            // 如果需要显示消息，打印提示信息"Startled, you drop the iron ball."
+
+        // 移除铁球作为武器、备用武器或弹药
         if (uwep == uball)
             setuwep((struct obj *) 0);
+            // 如果当前武器是铁球，将当前武器设为无
         if (uswapwep == uball)
             setuswapwep((struct obj *) 0);
+            // 如果备用武器是铁球，将备用武器设为无
         if (uquiver == uball)
             setuqwep((struct obj *) 0);
-        /* [this used to test 'if (uwep != uball)' but that always passes
-           after the setuwep() above] */
-        freeinv(uball); /* remove from inventory but don't place on floor */
+            // 如果弹药是铁球，将弹药设为无
+
+        // 从物品栏中移除铁球，但不放置到地面上
+        freeinv(uball);
+
+        // 更新负重状态并显示相关信息
         (void) encumber_msg();
     }
 }
 
+
 /* ball&chain might hit hero when falling through a trap door */
 void
 ballfall(void)
@@ -176,16 +185,20 @@ unplacebc_core(void)
     u.bc_felt = 0; /* feel nothing */
 }
 
-static boolean
-check_restriction(int restriction)
+static boolean check_restriction(int restriction)
 {
     boolean ret = FALSE;
 
+    // 检查是否没有限制或者当前限制与覆盖限制相同
     if (!bcrestriction || (restriction == override_restriction))
         ret = TRUE;
+        // 如果满足条件，则设置返回值为TRUE
     else
         ret = (bcrestriction == restriction) ? TRUE : FALSE;
+        // 否则，检查当前限制是否与传入的限制相同，并设置返回值为TRUE或者FALSE
+
     return ret;
+    // 返回结果
 }
 
 #ifndef BREADCRUMBS
@@ -283,22 +296,28 @@ Placebc(const char *funcnm, int linenum)
     placebc_core();
 }
 
-void
-Unplacebc(const char *funcnm, int linenum)
+void Unplacebc(const char *funcnm, int linenum)
 {
-
+    // 如果存在限制
     if (bcrestriction) {
         char panicbuf[BUFSZ];
 
+        // 创建错误消息字符串
         Sprintf(panicbuf, "Unplacebc from %s:%d, when restricted to %s:%d",
                 funcnm, linenum,
                 bcubreadcrumbs.funcnm, bcubreadcrumbs.linenum);
+
+        // 将错误消息记录到日志中
         paniclog("Unplacebc", panicbuf);
     }
+
+    // 禁用当前限制，启用上一个限制，并更新函数名和行号
     bcpbreadcrumbs.in_effect = FALSE;
     bcubreadcrumbs.in_effect = TRUE;
     bcubreadcrumbs.funcnm = funcnm;
     bcubreadcrumbs.linenum = linenum;
+
+    // 执行unplacebc_core函数
     unplacebc_core();
 }