1.他登上讲台对人群发表演说。

He mounted the platform and addressed the crowd. 2.她健步走上了讲台。She walked up to the platform without faltering. 3.他摇摇晃晃地走上讲台，调好麦克风，咳嗽了几声，接着脑子就一片空白。Unsteadily he mounted the podium, adjusted the microphone, coughed, and went completely blank. 4.你第一次登上讲台感到紧张是很自然的。Naturally, you were keyed up when you went on the platform for the first time. 5.这个专家走上讲台，坐在椅子上，准备好回答问题。The specialist walked onto the platform and seated himself in a chair, prepared for answering questions.