difficult test 难度高的测验
Test question too difficult 试题偏难
Test method of difficult-flammability for 建筑材料难燃性试验方法
Difficult salt-soluble calcium carbonate test 难溶盐碳酸钙试验
He found the test difficult but nevertheless made a good stab at it.
尽管他觉得试题很难，但还是尽力去做了。
Lastly, test results can be difficult to understand.
最后，测试结果可能很难理解。
For all the feelings readers attach to stories, literature is a numbers game, and the test of time is extremely difficult to pass.
论及读者对这些故事的所有感受，文学是一个数字游戏，但很难经受住时间的考验。
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