这一行为也适用于词汇表以外的单词，如果将它们以小写字母的形式输入到字典中的话，例如ipod。
This behavior applies also to out-of-vocabulary words if you type them in lower-case letters into your dictionary, such as ipod.
写一个读取文件的程序，把每一行拆分成一个个词，去掉空白和标点符号，然后把所有单词都转换成小写字母的。
Write a program that reads a file, breaks each line into words, strips whitespace and punctuation from the words, and converts them to lowercase.
中间线：在一行英文字里，沿着小写字母上端的一条假想线条。
Mean line: Imaginary line which runs along the top of the lower-case letters in a line of text.
每个忽略单词都以小写字母表示，并独占一行，且不会超过10个字符长度。
Each of the words to ignore appears in lower-case letters on a line by itself and is no more than 10 characters in length.
小猫想要赚得来自POJ 的一些钱，而且试着劝他的母亲看医生输入二线用在输入中的二上的小写字母个别地排成一行。
The little cat wants to earn some money from POJ, and try to persuade his mother to see the doctor : Input Two strings with lowercase letters on two of the input lines individually.
第一行输入包含一个字符串。它一定一个非空，只含小写字母，且长度不超过100的串。
The first input line contains the string. It's guaranteed, that the string is non-empty, consists of lower-case Latin letters, and its length doesn't exceed 100.
注：同一测定项目中，同一行数据小写字母不同者为差异显著（P<0.05）
Notes: Values in the same raw of same item with different superscripts differ significantly(P<0.05).
同一行上的不同小写字母表示同一层次不同处理在5 %水平上的显著差异(LSD)，下同。注。
Note: Different letters in the same row mean significant difference at 5 % level of probability (LSD), and they are the same as the following.
注：表中同一行数字不同大、小写字母分别表示0.01、0.05水平的差异显著性（下同）
Note: The different capital and small letters for number in a same column represent significant difference at 0.01 and 0.05 level, respectively.
注：表中同一行数字不同大、小写字母分别表示0.01、0.05水平的差异显著性（下同）
Note: The different capital and small letters for number in a same column represent significant difference at 0.01 and 0.05 level, respectively.
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