微信扫一扫
随时随地学习
随时随地学习
TVs ar mor usful than radios. From TV you can s and har what is happning in th world. Howvr, radios ar not disapparing. Thy ar still with us. And th numbr of listnrs is bcoming largr. Do you know why?
On rason for this is th invntion of th transistor. A transistor radio can b vry small. It is vry asy to b carrid. Bsids, radio broadcasts ar bttr for blind popl. Many old popl dont hav good ysight. Thy cant watch TV, but can listn to music or nws ovr th radio. Whats mor, a radio is chapr than a TV st.
邮箱： 