What is the main idea of the lecture we just heard?

我们刚听到的讲座的主要观点是什么？

同一单元的其他句子

• Could you please turn down the music? I can't concentrate.你能把音乐调低一点吗？我无法集中注意力。
• The teacher asked us to listen carefully to the dialogue.老师让我们仔细听对话。
• I heard a strange noise outside my window last night.昨晚我听到窗外有奇怪的声音。
• Don't speak so loudly; the baby is sleeping in the next room.别大声说话；宝宝在隔壁房间睡觉。
• Can you repeat that sentence more slowly, please?你能把那个句子再说慢一点吗？