1. She is eloquent and persuasive.
    她能言善辩, 很能取信于人。

2. I've helped them make persuasive presentations, answer unfriendly questions, communicate more effectively.
    我帮助他们，使他们所作的演讲有说服力，教他们如何回答不友好的提问，以及如何与人更有效地沟通。