现在一些收听声音的电器越来越小,以便人们便于随身携带。你知道世界上最小的收音机有多大吗?只有200纳米长、10纳米宽,而一根头发丝的直径有8万纳米,也就是400台这样的收音机排列起来只有一根头发丝粗。因此,这样的收音 Now some of the electrical appliances to listen to sound smaller and smaller, so that people are easy to carry. Do you know how big the world’s smallest radios are? Only 200 nanometers long and 10 nanometers wide, while a hair diameter of 80,000 nanometers, which is 400 such radios arranged in order to have only one hair thick. So, this radio