六年级英语翻译The first radios began in the 1920s.At than time the

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六年级英语翻译
The first radios began in the 1920s.At than time the sound was very
poor.So people had to listen on head-phones.
Television began in the 1930s.It was black and white.In the 1960s,the TV programmes began to have colour.
Do you know when computers begin?
帮忙翻译一下!

无限电诞生在1920年,然而那时的音质很差.所以人们不得不使用听简电话.
电视的出现在1930年,不过那时是黑白的.只到1960年,电视才有彩色的.
你知道我们什么时候开始用电脑吗?

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