@@ -411,6 +411,10 @@ msgid ""
411411"The mutable API is based on :class:`collections.MutableSequence "
412412"<collections.abc.MutableSequence>`."
413413msgstr ""
414+ "与 :class:`str` 一样，:class:`bytes` 类型是不可变的。 还有一个单独的 *可变* 类型用于保存带缓冲的二进制数据，即 "
415+ ":class:`bytearray`。 几乎所有接受 :class:`bytes` 的 API 也都接受 :class:`bytearray`。 "
416+ "这个可变 API 是基于 :class:`collections.MutableSequence "
417+ "<collections.abc.MutableSequence>`。"
414418
415419#: ../../whatsnew/3.0.rst:274
416420msgid ""
@@ -433,6 +437,9 @@ msgid ""
433437" tool (see below) replaces every occurrence of :class:`!basestring` with "
434438":class:`str`."
435439msgstr ""
440+ "内置的 :class:`!basestring` 抽象类型已被移除。 请改用 :class:`str`。 :class:`str` 和 "
441+ ":class:`bytes` 类型在功能上没有足够的共通性因此不需要有共享的基类。 ``2to3`` 工具（见下文）会将所有 "
442+ ":class:`!basestring` 都替换为 :class:`str`。"
436443
437444#: ../../whatsnew/3.0.rst:287
438445msgid ""
@@ -587,14 +594,16 @@ msgstr ""
587594
588595#: ../../whatsnew/3.0.rst:385
589596msgid "This sets *a* to ``0``, *b* to ``4``, and *rest* to ``[1, 2, 3]``."
590- msgstr ""
597+ msgstr "这会将 *a* 设为 ``0``，*b* 设为 ``4``，而将 *rest* 设为 ``[1, 2, 3]``。 "
591598
592599#: ../../whatsnew/3.0.rst:387
593600msgid ""
594601"Dictionary comprehensions: ``{k: v for k, v in stuff}`` means the same thing"
595602" as ``dict(stuff)`` but is more flexible. (This is :pep:`274` vindicated. "
596603":-)"
597604msgstr ""
605+ "新增字典推导式: ``{k: v for k, v in stuff}`` 的含义与 ``dict(stuff)`` 相同但是更为灵活。 "
606+ "(对此特性的解释见 :pep:`274`。 :-)"
598607
599608#: ../../whatsnew/3.0.rst:391
600609msgid ""
@@ -603,24 +612,26 @@ msgid ""
603612"``{x for x in stuff}`` means the same thing as ``set(stuff)`` but is more "
604613"flexible."
605614msgstr ""
615+ "新增集合字面值，例如 ``{1, 2}``。 请注意 ``{}`` 是空字典；要用 ``set()`` 表示空集合。 集合推导式也受到支持；例如 "
616+ "``{x for x in stuff}`` 的含义与 ``set(stuff)`` 相同但是更为灵活。"
606617
607618#: ../../whatsnew/3.0.rst:396
608619msgid ""
609620"New octal literals, e.g. ``0o720`` (already in 2.6). The old octal literals"
610621" (``0720``) are gone."
611- msgstr ""
622+ msgstr "新增八进制字面值，例如 ``0o720`` (已存在于 2.6 中)。 旧的八进制字面值 (``0720``) 已不复存在。 "
612623
613624#: ../../whatsnew/3.0.rst:399
614625msgid ""
615626"New binary literals, e.g. ``0b1010`` (already in 2.6), and there is a new "
616627"corresponding built-in function, :func:`bin`."
617- msgstr ""
628+ msgstr "新增二进制字面值，例如 ``0b1010`` (已存在于 2.6 中)，还有对应的新增内置函数 :func:`bin`。 "
618629
619630#: ../../whatsnew/3.0.rst:402
620631msgid ""
621632"Bytes literals are introduced with a leading ``b`` or ``B``, and there is a "
622633"new corresponding built-in function, :func:`bytes`."
623- msgstr ""
634+ msgstr "引入了带有 ``b`` 或 ``B`` 前缀的字节串字面值，还有对应的新增内置函数 :func:`bytes`。 "
624635
625636#: ../../whatsnew/3.0.rst:406
626637msgid "Changed Syntax"
@@ -664,6 +675,9 @@ msgid ""
664675" __metaclass__ = M\n"
665676" ..."
666677msgstr ""
678+ "class C:\n"
679+ " __metaclass__ = M\n"
680+ " ..."
667681
668682#: ../../whatsnew/3.0.rst:426
669683msgid "you must now use::"
@@ -674,6 +688,8 @@ msgid ""
674688"class C(metaclass=M):\n"
675689" ..."
676690msgstr ""
691+ "class C(metaclass=M):\n"
692+ " ..."
677693
678694#: ../../whatsnew/3.0.rst:431
679695msgid ""