【英语时差8,16】扩音器

 If you want to call to a friend half a block down a crowded street, you might cup your hands around your mouth to better aim your voice. Have you ever wondered why simple megaphones amplify¹ your voice so well? Actually, they work for two different reasons. First, they direct your voice. As sound emerges from your mouth, it travels outward in all directions, going left, right, up, and down, as well as straight ahead. Using a megaphone is a lot like using a funnel–it directs more sound toward your target, and allows less to scatter² to the sides. This is only half the story, though. Megaphones don’t simply aim the sound that you’re already making, they can actually draw more volume from your mouth in the first place.

1 amplify   

vt.放大，增强；详述，详加解说

参考例句：

• The new manager wants to amplify the company.新经理想要扩大公司。
• Please amplify your remarks by giving us some examples.请举例详述你的话。

2 scatter   

vt.撒，驱散，散开；散布/播；vi.分散，消散

参考例句：

• You pile everything up and scatter things around.你把东西乱堆乱放。
• Small villages scatter at the foot of the mountain.村庄零零落落地散布在山脚下。