1. The United States is making a $2 billion pledge to COVAX, with the promise of an additional $2 billion to urge others to step up as well.
step up 增加(数量等);提高(速度、强度等)
He urged donors to step up their efforts to send aid to Somalia
他敦促各捐赠方加快速度将援助物资送往索马里
。2. Going forward, all countries should participate in a transparent and robust process for preventing and responding to health emergencies, so the world learns as much as possible as soon as possible.
as much as possible 尽量;尽可能多
I had to fall in with her wishes as much as possible.
我不得不尽量顺从她的意愿
。