nl命令可以对行进行编号，这在输出文件时非常方便。
The nl command Numbers lines, which can be convenient when printing files.
利用该模型可以方便地对符合药典标准的产品质量进行进一步的评价。
Using the model, the products which have been up to standard of the Pharmacopoeia can be conveniently evaluated further.
本实用新型利用自行车行进时车轮的转动对轮胎自动充气，其工作可靠，安装方便。
The utility model uses the rotation of bicycle wheels in the process of travelling to automatically inflate tyres. The utility model is reliable in operation and convenient in installation.
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