编码纠错、检错是计算机应用中最重要的操作手段之一，也是软件、硬件设计中必不可少的一个重要环节。
One of the most important issues in computer applications is to detect and correct error codes, which is also a crucial step in software and hardware design.
掌纹特征的提取在掌纹自动识别系统中是一个必不可少的重要环节。
The feature extraction of palmprint is a necessary important step in automatic palmprint recognition system.
控制噪声污染是改善人居环境质量的重要环节，它是提供人们一个舒适、健康的居住环境必不可少的条件。
Noise pollution control is an important part to improve the quality of human settlements, which is an indispensable requirement to provide a pleasant and healthy living environment.
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