Cle
abbr. 克利夫蘭（Cleveland, 美國城市名）；建構主義學習環境（Constructivist Learning Environment）；漢語培訓中心（Chinese Language Education）
??? 情景例句
Hi, Peter.
彼得，你好。
I don't care.
我不在乎！
and by measuring the time interval between the taps and the receipt of the echoes, the depth of the sea at that point can be calculated.
測出回聲間隔的時間，便可算出該處海洋的深度。