重点讲解：
1. at play 发挥作用；
But there are also psychological factors at play.
但也有心理因素在起作用5,YRN3wgL6Jch@zK。
2. damp down 抑制，平息（强烈的感情、争吵或危机)；
The entire spending boost could go on wage demands unless expectations are damped down.
除非降低预期，否则整个支出增长计划可能会导致加薪要求(Lx!O1Mw(1nTk+XiSv&U。
3. ups and downs 兴衰；浮沉；起落；悲欢；
We are bound to see some ups and downs along the road to recovery.
在经济复苏的过程中，我们一定会经历一些曲折起伏3m&My5u*PqWgXD^Y7h。
4. correlate to 相互关联；
Assessing whether different biological populations have gene expression profiles that correlate to their biogeographical distribution.
探索不同生物种群的基因表达谱是否与生物地理分布相关联7Emry1J7vw!cy4.1。