(电台或电信局的)呼号;
At that time, call letters are not effective, in the end, through the media!
当时电话书信都不见成效, 最后还是通过媒体曝光!
the call letters WNBC
台号字母WNBC
Some schools call their dormitories after letters of the alphabet.
有些学校以字母表中的字母为宿舍楼命名.
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