Module 4 Unit 3 Tomorrow’s world 一.词汇复习篇:【单词】1. Upon reaching the top of the mountain, a feeling of happiness and a sense of achievement will be experienced. 到达顶峰时,观众心中将会涌起一种愉悦感和成就感。on / upon + doing 一…就…(用以表示某一特定场合)On entering the room, she saw him. 她一进这个房间便看到了他。【拓展】◆ in + doing 做…时,…发生时,当…时 In attempting