diff --git a/library/io.po b/library/io.po
index 7910d86d4a..229ca4a1c2 100644
--- a/library/io.po
+++ b/library/io.po
@@ -955,21 +955,25 @@ msgid ""
 "`BufferedIOBase` deals with.  This is not part of the :class:"
 "`BufferedIOBase` API and may not exist on some implementations."
 msgstr ""
+"底層的原始串流（一個 :class:`RawIOBase` 實例），:class:`BufferedIOBase` 處理"
+"的對象。這不是 :class:`BufferedIOBase` API 的一部分，且在某些實作可能不存在。"
 
 #: ../../library/io.rst:552
 msgid "Separate the underlying raw stream from the buffer and return it."
-msgstr ""
+msgstr "將底層的原始串流從緩衝區中分離出來，並回傳它。"
 
 #: ../../library/io.rst:554
 msgid ""
 "After the raw stream has been detached, the buffer is in an unusable state."
-msgstr ""
+msgstr "在原始串流被分離後，緩衝區處於一個不可用的狀態。"
 
 #: ../../library/io.rst:557
 msgid ""
 "Some buffers, like :class:`BytesIO`, do not have the concept of a single raw "
 "stream to return from this method.  They raise :exc:`UnsupportedOperation`."
 msgstr ""
+"某些緩衝區，如 :class:`BytesIO`，沒有單一原始串流的概念可從此方法回傳。它們會"
+"引發 :exc:`UnsupportedOperation`。"
 
 #: ../../library/io.rst:565
 msgid ""
@@ -977,6 +981,9 @@ msgid ""
 "or negative, data is read and returned until EOF is reached.  An empty :"
 "class:`bytes` object is returned if the stream is already at EOF."
 msgstr ""
+"讀取並回傳最多 *size* 個位元組。如果引數被省略、為 ``None`` 或為負值，將讀取"
+"並回傳資料直到達到 EOF 為止。如果串流已經處於 EOF，則回傳一個空的 :class:"
+"`bytes` 物件。"
 
 #: ../../library/io.rst:569
 msgid ""
@@ -986,12 +993,17 @@ msgid ""
 "raw read will be issued, and a short result does not imply that EOF is "
 "imminent."
 msgstr ""
+"如果引數為正數，且底層原始串流不是互動式的，可能會發出多次原始讀取來滿足位元"
+"組數量（除非首先達到 EOF）。但對於互動式原始串流，最多只會發出一次原始讀取，"
+"且短少的資料不表示 EOF 即將到來。"
 
 #: ../../library/io.rst:575 ../../library/io.rst:598 ../../library/io.rst:608
 msgid ""
 "A :exc:`BlockingIOError` is raised if the underlying raw stream is in non "
 "blocking-mode, and has no data available at the moment."
 msgstr ""
+"如果底層原始串流處於非阻塞模式，且當前沒有可用資料，則會引發 :exc:"
+"`BlockingIOError`。"
 
 #: ../../library/io.rst:580
 msgid ""
@@ -1000,12 +1012,17 @@ msgid ""
 "method.  This can be useful if you are implementing your own buffering on "
 "top of a :class:`BufferedIOBase` object."
 msgstr ""
+"讀取並回傳最多 *size* 個位元組，最多呼叫一次底層原始串流的 :meth:`~RawIOBase."
+"read` (或 :meth:`~RawIOBase.readinto`) 方法。如果你正在 :class:"
+"`BufferedIOBase` 物件之上實作自己的緩衝區，這可能會很有用。"
 
 #: ../../library/io.rst:586
 msgid ""
 "If *size* is ``-1`` (the default), an arbitrary number of bytes are returned "
 "(more than zero unless EOF is reached)."
 msgstr ""
+"如果 *size* 為 ``-1`` （預設值），則會回傳任意數量的位元組（除非達到 EOF，否"
+"則會超過零）。"
 
 #: ../../library/io.rst:591
 msgid ""
@@ -1013,12 +1030,16 @@ msgid ""
 "return the number of bytes read. For example, *b* might be a :class:"
 "`bytearray`."
 msgstr ""
+"讀取位元組到一個預先分配的、可寫的 :term:`bytes-like object` *b* 當中，並回傳"
+"讀取的位元組數量。例如，*b* 可能是一個 :class:`bytearray`。"
 
 #: ../../library/io.rst:595
 msgid ""
 "Like :meth:`read`, multiple reads may be issued to the underlying raw "
 "stream, unless the latter is interactive."
 msgstr ""
+"類似於 :meth:`read`，除非後者是互動式的，否則可能會對底層原始串流發出多次讀"
+"取。"
 
 #: ../../library/io.rst:603
 msgid ""
@@ -1027,6 +1048,9 @@ msgid ""
 "read` (or :meth:`~RawIOBase.readinto`) method. Return the number of bytes "
 "read."
 msgstr ""
+"讀取位元組到一個預先分配的、可寫的 :term:`bytes-like object` *b* 中，最多呼叫"
+"一次底層原始串流的 :meth:`~RawIOBase.read` （或 :meth:`~RawIOBase.readinto`）"
+"方法。此方法回傳讀取的位元組數量。"
 
 #: ../../library/io.rst:615
 msgid ""
@@ -1036,6 +1060,10 @@ msgid ""
 "implementation, these bytes may be readily written to the underlying stream, "
 "or held in a buffer for performance and latency reasons."
 msgstr ""
+"寫入給定的 :term:`bytes-like object`，*b*，並回傳寫入的位元組數量（總是等於 "
+"*b* 的長度，以位元組計，因為如果寫入失敗將會引發 :exc:`OSError`）。根據實際的"
+"實作，這些位元組可能會立即寫入底層串流，或出於性能和延遲的緣故而被留在緩衝區"
+"當中。"
 
 #: ../../library/io.rst:622
 msgid ""
@@ -1043,12 +1071,16 @@ msgid ""
 "needed to be written to the raw stream but it couldn't accept all the data "
 "without blocking."
 msgstr ""
+"當處於非阻塞模式時，如果需要將資料寫入原始串流，但它無法接受所有資料而不阻"
+"塞，則會引發 :exc:`BlockingIOError`。"
 
 #: ../../library/io.rst:626
 msgid ""
 "The caller may release or mutate *b* after this method returns, so the "
 "implementation should only access *b* during the method call."
 msgstr ""
+"呼叫者可以在此方法回傳後釋放或變更 *b*，因此實作應該僅在方法呼叫期間存取 "
+"*b*。"
 
 #: ../../library/io.rst:631
 msgid "Raw File I/O"