diff --git a/api/cover.py b/api/cover.py
index ea6fc15..860aff0 100644
--- a/api/cover.py
+++ b/api/cover.py
@@ -50,7 +50,7 @@ def cover_api():
     elif result.status_code == 404:
         abort(404)
     else:
-        abort(500, '后端存在错误，暂时无法查询')
+        abort(500, '服务存在错误，暂时无法查询')
 
 
 @v1_bp.route('/cover/<path:s_type>', methods=['GET'])
diff --git a/mod/args/__init__.py b/mod/args/__init__.py
index 6912472..a3ae7b4 100644
--- a/mod/args/__init__.py
+++ b/mod/args/__init__.py
@@ -91,7 +91,7 @@ def __init__(self):
         self.debug = kw_args.debug
         self.version = "1.5.4"
 
-    def valid(self, key):
+    def valid(self, key) -> bool:
         """
         返回该key是否有效
         :param key:
@@ -99,7 +99,7 @@ def valid(self, key):
         """
         return key in self.auth.keys()
 
-    def permission(self, key):
+    def permission(self, key) -> str:
         """
         返回该key的权限组字符串
         :param key:
diff --git a/mod/tools.py b/mod/tools.py
index 8e9e26f..7a9b4b2 100644
--- a/mod/tools.py
+++ b/mod/tools.py
@@ -68,7 +68,9 @@ def standard_lrc(lrc_text: str) -> str:
     if not lrc_text or type(lrc_text) is not str:
         return lrc_text
     elif '[' in lrc_text and ']' in lrc_text:
-        lrc_text = lrc_text.replace("\r\n", "\n")
+        # 去除零宽字符
+        lrc_text = re.sub(r'[\ufeff\u200b]', '',
+                          lrc_text.replace("\r\n", "\n"))
         pattern = re.compile(r'\[([^]]+)]')
         # 使用findall方法找到所有匹配的字符串
         matches = pattern.findall(lrc_text)
@@ -81,4 +83,5 @@ def standard_lrc(lrc_text: str) -> str:
         # 进行匹配和替换
         return re.sub(pattern, lambda match: "[" + match.group(1) + "0]", lrc_text)
     else:
-        return lrc_text.replace("\r\n", "\n")
+        return re.sub(r'[\ufeff\u200b]', '',
+                          lrc_text.replace("\r\n", "\n"))