You must try it in person so as to obtain the first hand materials.
你必须亲自试一试才能获得第一手资料。
Through questionaire, the first hand materials can be obtained in terms of customers perceived fairness.
采用问卷调查的方式，能够获得消费者公平度感知的第一手资料。
Through case studying, a lot of first hand materials are employed in this part to show how the barristers influenced judicial practice.
该部分运用了大量一手资料，通过详细的案例分析，展现了出庭律师在刑事司法中的影响。
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