He works always by rule and line, never by chance or guess.

他一向办事精细, 从不靠运气或凭猜测.

《简明英汉词典》

You must measure the length by rule and line.

你必须准确地计量长度.

《现代汉英综合大词典》

Science will conquer all mysteries by rule and line.

科学家会准确地揭开所有的神秘.

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The students were told to go about the experiment by rule and line.

学生知道做实验必须准确.

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