动态存储管理是计算机系统必不可少的资源管理手段之一。
Dynamic memory management is necessary for memory resource management in computer system.
人们普遍认为计算机和其他机器已经成为了我们社会必不可少的一个部分，它们是我们生活更舒适，减少了大量的劳动力。
It is widely acknowledge that computer and other machines have become an indispensable part of our society, which make our life and work more comfortable and less laborious.
从长远看，我们必须学习更多的科技知识，除了掌握主修的专业之外，懂得计算机、英语和驾驶是我们工作中必不可少的。
In the long run, we should learn more about science and technology. Besides our major subjects, knowledge of computers, English and driving is necessary for our work.
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