The introduction typically begins with a general statement of the problem area, with a focus on a specific research problem, to be followed by the rational or justification for the proposed study.
引言一般以对该领域的简单描述开始，同时关注某一特定的研究问题，接下来是拟定研究的基本原理。
This summary should detail the rationale used to conduct the study, and include a justification of the control strategy implemented following the risk assessment.
该摘要应详细说明用于研究的原理，在风险评估后面说明对所实施的控制策略的论证。
The ultimate goal for economists to study theory of value is to defend the historical necessity and justification of the class they presented and the production way they ask.
经济学家研究价值理论，其根本目的是为其所代表的阶级以及所要求的生产方式的历史必然性和正义性申辩。
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