xargs命令可从管道中读取数据并为每行读取内容运行指定命令。
Xargs reads data from a pipe and runs a specified command for every line read.
继续读取文件，直至到达文件末尾，边读取边打印每行。
Keep reading the file until you are at the end, printing each line as you read it.
Perl的-p选项告诉它读取和处理标准输入中的每行内容，并将结果打印到标准输出。
Perl's -p option tells it to read and process each line from standard input and print the results to standard output.
这个人们可以读取的文件中包含了一系列地址信息 ——每行一个地址，每行都有一个前缀字符。
This human-readable file contains a list of addresses -- one per line, each with a prefix character.
我们按顺序逐行检查，获得每行第一个项的模型索引，然后读取存储在模型项里的数据。
We examine each row in turn, obtaining a model index for the first item in each row, and read the data stored for that item in the model.
我们按顺序逐行检查，获得每行第一个项的模型索引，然后读取存储在模型项里的数据。
We examine each row in turn, obtaining a model index for the first item in each row, and read the data stored for that item in the model.
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