1.depend heavily on 严重依赖
Health systems in a number of high-income countries depend heavily on doctors and nurses who have been trained abroad.
若干高收入国家的卫生系统严重依赖在国外接受培训的医生和护士。

2.senior fellow 高级研究员
Gary Clyde Hufbauer is the Reginald Jones senior fellow at the Peterson Institute for International Economics.
盖里-克莱德-胡弗鲍尔是彼得森国际经济学学院雷金纳德-琼斯的高级研究员。

3.gain access to 可以获得
Poor nations meanwhile could gain access to low-carbon technology which they could not otherwise afford.
与此同时，贫穷国家也可以获得低碳技术，否则它们将负担不起。

4.collaborate with 与...合作
Will you collaborate with me to finish the project?
你会和我合作完成这个项目吗？