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.
测试工件和资源组织是测试管理中显然必不可少的部分。
Test artifact and resource organization is a clearly necessary part of test management.
仔细的规划和务实的评价资源必不可少。
Careful planning and realistic assessment of resources is essential.
水资源是一个较大的自然资源，并也是环境中必不可少的组成部分。
Water resource is a major natural resource and also an essential clement of environment.
人力资源管理系统是现代公司和企业必不可少的基础设施与技术支撑环境。
HR management system is the fundamental facility and technical supporting environment of modern corporations.
水资源是人类生存和生活必不可少的自然资源。
Water is essential to human survival and living as natural resources.
水资源是一个较大的自然资源，并也是环境中必不可少的组成部分。
Fresh water is a natural resource, and at the same time, a scanty resource.
水资源是一个较大的自然资源，并也是环境中必不可少的组成部分。
Fresh water is a natural resource, and at the same time, a scanty resource.
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