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重点讲解：
1. carry out 实施；执行；实行；
The Duke was not well enough to carry out such an exacting task.
公爵身体不太好，无法执行那么艰巨的任务。
2. center on （使）以…为中心；（使）注意力集中于；
Our discussion today will centre on technical innovation.
今天重点讨论技术革新问题。
3. call for 要求；呼吁；
Officials used loud hailers to call for calm.
官员们用扩音器呼吁大家保持冷静。
4. be aimed at 旨在；目的是；
The discussions are aimed at paving the way for formal negotiations between the two countries.
讨论旨在为两国进行正式谈判铺平道路。
