Translate ../../library/string.rst:420-430 (#712)

Co-authored-by: Wei-Hsiang (Matt) Wang <[email protected]>

Author: heyimkaijoe

library/string.po

@@ -553,6 +553,9 @@ msgid ""
 "``'X'``, underscores will be inserted every 4 digits.  For other "
 "presentation types, specifying this option is an error."
 msgstr ""
+"``’_’`` 選項表示對於浮點表示型別和整數表示型別 ``’d’`` 使用下劃線作為千位分隔"
+"符號。對於整數表示型別 ``’b’``，``’o’``，``’x’`` 和 ``’X’``，每 4 位數字會插"
+"入底線。對於其他表示型別，指定此選項會出錯。"
 
 #: ../../library/string.rst:427
 msgid "Added the ``'_'`` option (see also :pep:`515`)."
@@ -564,6 +567,8 @@ msgid ""
 "including any prefixes, separators, and other formatting characters. If not "
 "specified, then the field width will be determined by the content."
 msgstr ""
+"*width* 是一個十進制整數，定義了最小總欄位寬度，包括任何前綴、分隔符號和其他"
+"格式字元。如果未指定，則欄位寬度將由內容決定。"
 
 #: ../../library/string.rst:434
 msgid ""