需要确保测试和训练文件没有重合，否则会造成结果不准确。
It is important that the test and training documents do not overlap, which could skew the results.
然后他们测试了跑调者的听音能力并找出了他们听得不准的地方。
They then tested the bad singers’ ability to listen to some music and identify the sour notes. They found that the off-pitch crooners fall into two classes.
谁在使用哪台机器的日常状态信息并不准确，如果他们很早就完成了测试任务，很少会有人尽早登记到他们的机器上，即使他们不再回顾记录。
The status of who is using which computer daily is inaccurate, and few people check in their machines early if they finish their testing early, if they check them back in at all.
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