A large amount of first hand data have been gained by the field investigation of the carbonate karst of the Ordovician system in the Xishan Hill of Beijing.

通过对北京西山奥陶系碳酸盐岩岩溶的野外调查，取得了大量的第一手资料。

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However, as most Linux kernel testing efforts have only been conducted over short periods of time, this series of tests provides us first-hand data and results of longer runs.

然而，由于大部分的Linux内核测试工作历时都比较短，因此本系列测试为我们提供了长时间运转的第一手数据和结果。

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The system has the data analysis processing function, which can provide the first-hand data of the train running status, the line condition analysis and the vehicles design and the maintenance.

提供数据分析处理功能，为列车运行状态、线路状态的分析和车辆设计及维护提供了第一手数据。

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If funds are forthcoming, the team will visit them all in the coming months to gather first-hand data on tree deaths.

BBC: Amazon drought 'severe' in 2010, raising warming fears

Constantly look for first-hand data rather than relying on anecdotal information.

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