It's just very time consuming to get such a large quantity of data.
要收集这么多的数据就是非常耗时。
If you can just find out the user's session ID, you have a large quantity of data available.
如果能够找到用户的会话id，就能够找到大量数据。
The useful quality information can be gained by using of statistics, because the quality control deals with large quantity of data.
质量控制工作涉及到大量的质量数据，运用数理统计学的知识把这些数据进行整理、归纳就可以得到我们所关心的质量信息。
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