His to-do list was dispiritingly inadequate on some of the thorniest problems.

在一些最棘手的问题上，他的待办事项清单令人沮丧地不足。

youdao

Testing performance is one of the thorniest areas of unit testing.

测试性能是单元测试最为痛苦的方面之一。

youdao

This has become one of the thorniest issues in the REDD negotiations.

这成为在REDD谈判中的最棘手的问题之一。

youdao

The industry has already settled the thorniest issue: what type of connector to use.

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