Street Wise

Shhhh! I'm teaching myself to speak 'dolphin'

作者：21ST

DOLPHINS have a remarkable method for navigating through dark waters. They have a special organ in their nose to make clicking sounds, which they use to determine what is ahead of them by listening to the echo.

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。