zh-CN: Add translation for pattern-matching.md (#821)

* [zh-CN] Add translation for pattern-matching.md

* Update po/zh-CN.po

Co-authored-by: wnghl <wnghilin@gmail.com>

---------

Co-authored-by: wnghl <wnghilin@gmail.com>

po/zh-CN.po

@@ -284,7 +284,7 @@ msgstr ""
 
 #: src/SUMMARY.md:85
 msgid "Pattern Matching"
-msgstr ""
+msgstr "模式匹配"
 
 #: src/SUMMARY.md:86
 msgid "Destructuring Enums"
@@ -5799,18 +5799,18 @@ msgstr ""
 
 #: src/pattern-matching.md:1
 msgid "# Pattern Matching"
-msgstr ""
+msgstr "# 模式匹配"
 
 #: src/pattern-matching.md:3
 msgid ""
 "The `match` keyword let you match a value against one or more _patterns_. "
 "The\n"
 "comparisons are done from top to bottom and the first match wins."
-msgstr ""
+msgstr "使用关键词 `match` 对一个值进行模式匹配。进行匹配时，会从上至下依次进行比较，并选定第一个匹配成功的结果。"
 
 #: src/pattern-matching.md:6
 msgid "The patterns can be simple values, similarly to `switch` in C and C++:"
-msgstr ""
+msgstr "模式 (pattern) 可以是简单的值，其用法类似于 C 与 C++ 中的 `switch` 。"
 
 #: src/pattern-matching.md:8
 msgid ""
@@ -5830,7 +5830,7 @@ msgstr ""
 
 #: src/pattern-matching.md:21
 msgid "The `_` pattern is a wildcard pattern which matches any value."
-msgstr ""
+msgstr "模式 `_` 是外卡 (wildcard) 模式。它可以匹配任何值。"
 
 #: src/pattern-matching.md:26
 msgid ""
@@ -5847,6 +5847,13 @@ msgid ""
 "as the term can show up in error messages.\n"
 "   "
 msgstr ""
+"* 你可以解释一些用于表达模式的特殊字符的用法\n"
+"  *`|` 表示或 (or)\n"
+"  *`..` 可以展开为任意一个或多个值\n"
+"  *`1..=5` 代表了一个闭区间范围\n"
+"* 解释模式匹配中的绑定的原理可能会很有帮助。比如可以用一个变量替代外卡，或者去除 `q` 外面的引号。\n"
+"* 你可以展示如何匹配一个引用。\n"
+"* 现在是一个讲解不可反驳 (irrefutable) 模式的好时机。因为这个术语可能会出现在错误信息中。"
 
 #: src/pattern-matching/destructuring-enums.md:1
 msgid "# Destructuring Enums"