Add more translations of library/io (#776)

Author: cschan1828

library/io.po

@@ -921,25 +921,33 @@ msgid ""
 "data; unlike their :class:`RawIOBase` counterparts, they will never return "
 "``None``."
 msgstr ""
+"此外，如果底層的原始串流處於非阻塞模式且無法提供或接收足夠的資料，這些方法可"
+"能會引發 :exc:`BlockingIOError` 例外；與 :class:`RawIOBase` 不同之處在於，它"
+"們永遠不會回傳 ``None``。"
 
 #: ../../library/io.rst:534
 msgid ""
 "Besides, the :meth:`read` method does not have a default implementation that "
 "defers to :meth:`readinto`."
-msgstr ""
+msgstr "此外，:meth:`read` 方法不存在一個遵從 :meth:`readinto` 的預設實作。"
 
 #: ../../library/io.rst:537
 msgid ""
 "A typical :class:`BufferedIOBase` implementation should not inherit from a :"
 "class:`RawIOBase` implementation, but wrap one, like :class:`BufferedWriter` "
 "and :class:`BufferedReader` do."
 msgstr ""
+"一個典型的 :class:`BufferedIOBase` 實作不應該繼承自一個 :class:`RawIOBase` 的"
+"實作，而是應該改用包裝的方式，像 :class:`BufferedWriter` 和 :class:"
+"`BufferedReader` 那樣的作法。"
 
 #: ../../library/io.rst:541
 msgid ""
 ":class:`BufferedIOBase` provides or overrides these data attributes and "
 "methods in addition to those from :class:`IOBase`:"
 msgstr ""
+":class:`BufferedIOBase` 除了提供或覆寫來自 :class:`IOBase` 的資料屬性和方法以"
+"外，還包含了這些："
 
 #: ../../library/io.rst:546
 msgid ""