n.测试
adj.伤脑筋的;试验的
动词test的现在分词.
Good teaching and good testing are closely related. 出色的教学工作与完善的测试制度密切相关。
He pioneered several new testing methods. 他首创了几条新的测试方法。
This has been a testing time for us all. 对我们大家来说,这是一段伤透脑筋的时刻。