diff --git a/requirements.txt b/requirements.txt
index b6592d70..d767e21a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,5 +27,5 @@ dingtalk_stream
 # wecom bot websocket mode
 websocket-client>=1.4.0
 pycryptodome
-# telegram bot (requires Python >= 3.9; skipped on older versions)
-python-telegram-bot; python_version >= "3.9"
+# telegram bot
+python-telegram-bot
diff --git a/translate/__init__.py b/translate/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/translate/baidu/__init__.py b/translate/baidu/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/translate/youdao/__init__.py b/translate/youdao/__init__.py
new file mode 100644
index 00000000..e69de29b