In pilot and field studies, test takers took both the existing TOEIC test and the new test. Statistical analysis of the results confirmed that the difficulty level of the two tests was equivalent.

在试验研究中，考生同时参加了现行托业考试和新托业考试，考试结果的数据分析表明两个考试的难度是相同的。

The researchers are now attempting to refine their tests to pick out the individual features in a voice that lead to recognition, to see which she has most difficulty with.

研究人员现在正试图对测试进行优化，选出对声音识别有决定性的特征，以帮助判断她是在哪些方面出现了问题。

The final round of tests was the same difficulty level as the initial test.

最后一组测验的难度水平与最初的一组相似。