Update 20_Fuzziness.md

add translation for 270_Fuzzy_matching/20_Fuzziness

Author: aiddroid

270_Fuzzy_matching/20_Fuzziness.md

@@ -1,53 +1,46 @@
-[[fuzziness]]
-=== Fuzziness
+[[模糊]]
+=== 模糊
 
-_Fuzzy matching_ treats two words that are ``fuzzily'' similar as if they were
-the same word.((("typoes and misspellings", "fuzziness, defining"))) First, we need to define what((("fuzziness"))) we mean by _fuzziness_.
+_模糊匹配_ 视两个单词 ``模糊'' 相似,正好像它们是同一个词.
+((("typoes and misspellings", "fuzziness, defining"))) 首先, 我们需要通过_fuzziness_ 来定义什么是((("fuzziness"))).
 
-In 1965, Vladimir Levenshtein developed the
-http://en.wikipedia.org/wiki/Levenshtein_distance[Levenshtein distance], which
-measures ((("Levenshtein distance")))the number of single-character edits required to transform
-one word into the other. He proposed three types of one-character edits:
+1965年, Vladimir Levenshtein 开发了
+http://en.wikipedia.org/wiki/Levenshtein_distance[Levenshtein distance(Levenshtein距离)], 用来度量把一个单词转换为另一个单词需要的单字符编辑次数 ((("Levenshtein distance"))).
+他提出了3种单字符编辑:
 
-* _Substitution_ of one character for another: _f_ox -> _b_ox
+* _替换_ 一个字符到另一个字符: _f_ox -> _b_ox
 
-* _Insertion_ of a new character: sic -> sic_k_
+* _插入_ 一个新字符: sic -> sic_k_
 
-* _Deletion_ of a character:: b_l_ack -> back
+* _删除_ 一个字符:: b_l_ack -> back
 
 http://en.wikipedia.org/wiki/Frederick_J._Damerau[Frederick Damerau]
-later expanded these operations ((("Damerau, Frederick J.")))to include one more:
+稍后扩展了这些操作并包含了1个新的 ((("Damerau, Frederick J."))):
 
-* _Transposition_ of two adjacent characters: _st_ar -> _ts_ar
+* _换位_ 调整字符: _st_ar -> _ts_ar
 
-For example, to convert the word `bieber` into `beaver` requires the
-following steps:
+例如,把 `bieber` 转换为 `beaver` 需要以下几步:
 
-1. Substitute `v` for `b`: bie_b_er -> bie_v_er
-2. Substitute `a` for `i`: b_i_ever -> b_a_ever
-3. Transpose `a` and `e`:  b_ae_ver -> b_ea_ver
+1. 用 `v` 替换掉 `b`: bie_b_er -> bie_v_er
+2. 用 `a` 替换掉 `i`: b_i_ever -> b_a_ever
+3. 换位 `a` 和 `e` :  b_ae_ver -> b_ea_ver
 
-These three steps represent a
-http://bit.ly/1ymgZPB[Damerau-Levenshtein edit distance]
-of 3.
+以上的3步代表了3个
+http://bit.ly/1ymgZPB[Damerau-Levenshtein edit distance(Damerau-Levenshtein编辑距离)].
 
-Clearly, `bieber` is a long way from `beaver`—they are too far apart to be
-considered a simple misspelling.  Damerau observed that 80% of human
-misspellings have an edit distance of 1. In other words, 80% of misspellings
-could be corrected with a _single edit_ to the original string.
+显然, `bieber` 距 `beaver`&#x2014很远;远得无法被认为是一个简单的拼写错误.
+Damerau发现 80% 的人类拼写错误的编辑距离都是1. 换句话说, 80% 的拼写错误都可以通过 _单次编辑_ 
+修改为原始的字符串.
 
-Elasticsearch supports a maximum edit distance, specified with the `fuzziness`
-parameter, of 2.
+通过指定 `fuzziness` 参数为 2,Elasticsearch 支持最大的编辑距离.
 
-Of course, the impact that a single edit has on a string depends on the
-length of the string.  Two edits to the word `hat` can produce `mad`, so
-allowing two edits on a string of length 3 is overkill. The `fuzziness`
-parameter can be set to `AUTO`, which results in the following maximum edit distances:
+当然, 一个字符串的单次编辑次数依赖于它的长度.  对 `hat` 进行两次编辑可以得到 `mad`,
+所以允许对长度为3的字符串进行两次修改就太过了. `fuzziness`
+参数可以被设置成 `AUTO`, 结果会在下面的最大编辑距离中:
 
-* `0` for strings of one or two characters
-* `1` for strings of three, four, or five characters
-* `2` for strings of more than five characters
+* `0` 1或2个字符的字符串
+* `1` 3、4或5个字符的字符串
+* `2` 多于5个字符的字符串
 
-Of course, you may find that an edit distance of `2` is still overkill, and
-returns results that don't appear to be related. You may get better results,
-and better performance, with a maximum `fuzziness` of `1`.
+当然, 你可能发现编辑距离为`2` 仍然是太过了, 返回的结果好像并没有什么关联. 
+把 `fuzziness` 设置为 `1` ,你可能会获得更好的结果和性能.