通常，要求之后有解释，以说明采取相应决策的原因。
The requirements are typically followed by an explanation as to why the decision was taken.
如果你不知道什么时候回来上班，那就明确说明，并解释不能确定的原因。
If you don "t know when you will be back, explain this and the reason why you don" t know.
也对研究这个课题的原因和问题进行解释和说明。
Research objectives and research questions provide a clearer direction to complete this research.
也对研究这个课题的原因和问题进行解释和说明。
Research objectives and research questions provide a clearer direction to complete this research.
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