Options allow you to control the output from wc or to display other information such as maximum line length.

可以使用选项控制wc的输出，或者显示其他信息，比如行的最大长度。

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With multiple files, grep with the -c option returns a separate count for each file, one on each line, whereas a pipe to wc gives a total count for all files combined.

对于多个文件，带- c选项的grep返回每个文件的单独计数，每行一个计数，而针对wc的管道则提供所有文件的组合总计数。

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WC catalyst was prepared by temperature-programmed reduction and was oxygen-modified on surface to do line evaluation.

采用程序升温还原法制备了WC 催化剂，在做了表面氧修饰后对其进行了原位评价。

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