Comparing a system use case and an essential use case.
比较系统用例和基本用例。
The system use case has more steps than the essential use case.
系统用例的步骤比基本用例的步骤多。
A project manager may use essential use cases to determine how many iterations will be required.
项目经理可以使用基本的使用用例来确定需要多少次迭代。
An essential use case model, often referred to as a business or abstract use case model, models a technology-independent view of your behavioral requirements.
基本用例模型，通常称为商业或抽象用例模型，对行为需求的与技术无关的视图建模。
An essential use case, on the other hand, is based on the purpose or intentions of a user, rather than on the concrete steps or mechanisms by which the purpose or intention might be carried out.
另一方面，基本用例基于用户的目的或意图，而不是基于实现目的或意图可能依据的具体步骤或机制。
Economic law does not deny market regulations, actually, it corrects the inherent short coming of market regulations so as to defend the essential use of market regulating.
经济法不是要否定市场调节的作用，而是为了纠正市场调节的固有缺陷，以维护市场调节的基础性作用。
However, many students have difficulty in writing the thesis statement, mainly because they are not sure of its rules and requirements, nor certain of its writing procedure and essential use.
论题句是英语专业毕业论文写作中的一个重要环节，在一定程度上，它直接影响论文写作的质量。
Aircraft uses more fuel than cars and produces more pollution. Some people suggest the non-essential use of aircraft like international travel should be discouraged. Do you agree or disagree?
飞机比汽车造成了更加严重的污染，有人建议类似国际游览这类不必要旅行应该加以限制，你的观点。
Essential use cases are abstract, lightweight, technology-free dialogues between user and system.
本质用例描述了用户与系统间抽象、轻量级和技术无关的对话过程。
Essential use cases are abstract, lightweight, technology-free dialogues between user and system.
本质用例描述了用户与系统间抽象、轻量级和技术无关的对话过程。
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