diff --git a/library/os.po b/library/os.po
index 7369950f4b..8e5e0369c7 100644
--- a/library/os.po
+++ b/library/os.po
@@ -200,6 +200,8 @@ msgid ""
 ":func:`locale.getpreferredencoding` returns ``'utf-8'`` (the *do_setlocale* "
 "argument has no effect)."
 msgstr ""
+":func:`locale.getpreferredencoding` 回傳 ``'utf-8'``\\ （*do_setlocale* "
+"引數並無任何效果）。"
 
 #: ../../library/os.rst:119
 msgid ""
@@ -215,6 +217,8 @@ msgid ""
 "On Unix, :func:`os.device_encoding` returns ``'utf-8'`` rather than the "
 "device encoding."
 msgstr ""
+"在 Unix 中，:func:`os.device_encoding` 回傳 ``'utf-8'`` 而非"
+"裝置編碼。"
 
 #: ../../library/os.rst:127
 msgid ""
@@ -222,6 +226,9 @@ msgid ""
 "envvar:`PYTHONIOENCODING` (just as they can be in the default locale-aware "
 "mode)."
 msgstr ""
+"請注意，在 UTF-8 模式中，標準的串流設定會被 "
+":envvar:`PYTHONIOENCODING` 覆蓋（如同在預設在地化覺察 "
+"模式一樣）。"
 
 #: ../../library/os.rst:131
 msgid ""
@@ -234,10 +241,12 @@ msgid ""
 "Command line arguments, environment variables and filenames are decoded to "
 "text using the UTF-8 encoding."
 msgstr ""
+"命令列引數、環境變數及檔案名稱會以 UTF-8 編碼形式來被解碼成文字。"
 
 #: ../../library/os.rst:136
 msgid ":func:`os.fsdecode` and :func:`os.fsencode` use the UTF-8 encoding."
 msgstr ""
+":func:`os.fsdecode` 和 :func:`os.fsencode` 使用 UTF-8 編碼。"
 
 #: ../../library/os.rst:137
 msgid ""
@@ -438,6 +447,8 @@ msgid ""
 "Calling :func:`putenv` directly does not change :data:`os.environ`, so it's "
 "better to modify :data:`os.environ`."
 msgstr ""
+"呼叫 :func:`putenv` 並不會改變 :data:`os.environ`，"
+"所以建議直接修改 :data:`os.environ`。"
 
 #: ../../library/os.rst:216
 msgid ""
@@ -727,6 +738,7 @@ msgstr ""
 #: ../../library/os.rst:571
 msgid "The function is now always available."
 msgstr ""
+"此函式現在都會是可用的。"
 
 #: ../../library/os.rst:577
 msgid "Set the current process's effective group id."