Survey the material first to get a sense of it: formulate some questions.

考查原始材料首先要了解它的意义：用公式解答问题。

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Survey the scene of the accident and collect relevant material evidences.

勘查事故现场，汇集有关物证。

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Survey the scene of the accident and collect relevant material evidences.

勘查事故现场，汇集有关物证。

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