When the science is explained step by step and the facts are connected one by one, the details become clear and understandable.

只要逐步的解释清楚，并把这些内容联系起来理解，这些细节就会变得清晰明白。

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Four topics are discussed one by one according to the lucubrating step by step.

根据问题的逐步深入，有四个议题被一一展开。

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Let us discuss these problems one by one. (step by step).

让我们一个一个地(一步一步地)讨论这些问题。

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Let us discuss these problems one by one. (step by step).

让我们一个一个地(一步一步地)讨论这些问题。

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