1. 棘手难题 – a truly challenging problem
2. 一小部分 – a subset of individuals
3. 关注重点 – a subject deserving focus
4. 一系列的事物或事件序列 – a sequence of things or events in a row
5. 特别地，尤其是 – particularly so, especially
6. 不在场或缺席 – absent from the scene or position
7. 资源丰富，富足 – be abundant in resources or something
8. 为某事提供解释 – furnish an explanation for something
9. 指控某人某事 – accuse someone of a specific deed
10. 增加总量或数目 – add to the total or amount
11. 最后结果，终究 – in the final ysis or outcome
12. 同意某事物或观点 – be in agreement with someone or something regarding a particular matter
13. 提前完成或超越计划 – accomplish ahead of schedule or time
14. 在某事之前预先准备 – prepare beforehand or in advance of a particular event or matter
15. 与某事相反的情况或观念 – be alien to the practices or concepts of something specific
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