Language Lab

Inventions face hurdles

作者：21ST

INVENTIONS must leap seven hurdles before they can transform our lives. The first is in the mind of the inventor, who has to think up something radically new. Telecommunications began in 1753 whe...

点击阅读全文

对本期电子报订户、有效期内的VIP教师会员和本学期二十一世纪英文报尊享卡用户，我们开放所有内容：
如果您拥有以上权限，请点这里登录；
订阅电子报，请点这里；
激活VIP教师卡，请点这里；
激活21英语尊享卡，请点这里。