You have all heard it repeated that men of science work by means of induction and deduction, that by the help of these operation

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问题 You have all heard it repeated that men of science work by means of induction and deduction, that by the help of these operations, they, in a sort of sense, manage to extract from Nature certain natural laws, and that out of these, by some special skill of their own, they build up their theories.

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答案你们都多次听说过,科学家是用归纳法和演绎法工作的,而且从某种意义上来说,他们依靠这种方法力求从自然界归纳出某些自然规律,然后根据这些规律,用自己的某种专长,建立起他们的理论。

解析 本句是一个由三个that引导的宾语从句构成的主从复合句。it为形式宾语,代替三个真正的宾语从句,句中有许多介词短语作状语。
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