forced displacement of people threaten to reverse much of thedevelopment progress made in recent decades.被迫流离失所的人民大概使近几十年来获得的很多进步进展倒退
1. forced displacement of people
2. threaten to
对这两点不理解。请老师指教。
1. 人民的被迫流离失所。
2. threaten to 就是本身的意思，对。。。构成威胁，不利影响等意思。不过threaten要有s 或ed. 由于主语是单数displacement