diff --git a/library/string.po b/library/string.po
index e90d211cfe..f9815e9c69 100644
--- a/library/string.po
+++ b/library/string.po
@@ -469,7 +469,7 @@ msgstr "``'+'``"
 msgid ""
 "indicates that a sign should be used for both positive as well as negative "
 "numbers."
-msgstr ""
+msgstr "表示正數與負數均需使用符號。"
 
 #: ../../library/string.rst:378
 msgid "``'-'``"