testing
adjective uk/ˈtes.tɪŋ/ us/ˈtes.tɪŋ/
困难的，棘手的
difficult
These are very testing times for our family. 这些日子是我们家极其困难的时期。
This testing circuit is a challenge for any racing driver. 这个测试车场对任何赛车手都是个挑战。
testing
noun [ U ] uk/ˈtes.tɪŋ/ us/ˈtes.tɪŋ/
（知识或能力）测试
the act or practice of giving tests to measure someone's knowledge or ability
Statewide testing begins this fall. 全国考试从今年秋天开始。