Every family has problems, the difference is the difficulty level.
家家都有一本难念的经，只是经书的难度稍有不同。
What is the difficulty level of the entrance exam?
入学考试的难度如何？
At the same time, it decreases the difficulty level for the workers.
同时大大的降低了工作人员的工作难度。
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。
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。
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