be preoccupied with 关注，致力于，
GATT has been increasingly preoccupied with the trading problems and needs of the developing
致力于……，关注
unravel
[T] to understand or explain something that is mysterious or complicated 理解；解释，阐明
Detectives are still trying to unravel the mystery surrounding his death.
侦探们仍在试图解开他的死亡之谜。
2
[I,T] if you unravel threads, string etc, or if they unravel, they stop being twisted together 解开，拆散〔缠在一起的线、绳等〕；(使)松开
3
[I] if a system, plan, organization etc unravels, it starts to fail 〔系统、计划、组织等〕瓦解，崩溃, 体制的解体
SYN fall apart
The company started to unravel when two of the directors were arrested.
两名董事被捕以后，公司开始分崩离析
stifle v.
英 / 'staɪf ə l / [T] to stop something from happening or developing 抑止，阻止，压制
OPP encourage
rules and regulations that stifle innovation 压制创新的规章制度
How can this party stifle debate on such a crucial issue? 该党怎么可以压制对这么一个重要问题的辩论？
[T] to stop a feeling from being expressed 强忍住，压抑〔感情〕
He stifled an urge to hit her. 他强忍住冲动，没有打她。
stifle a yawn/smile/grin etc
I tried to stifle my laughter.
我竭力忍住不笑。
fraught
1. ADJ If a situation or action is fraught with problems or risks, it is filled with them. 充满 (问题或风险) 的
fraught with problems/difficulties/danger etc
full of problems etc 充满问题/困难/危险等
Their marriage has been fraught with difficulties. 他们的婚姻困难重重。
2. full of anxiety or worry 焦虑不安的；非常紧张的
SYN tense, worrisome
a fraught atmosphere 焦虑的氛围
a fraught situation 令人担心的形势
scourge n. [C] / skɜːdʒ ; skɝdʒ /
英 / skɜːdʒ /something that causes a lot of harm or suffering 祸根，祸害
[+ of ]
the scourge of unemployment 失业的祸害
the scourge of war 战争的祸害