A " disk jockey" or " deejay" is a person who plays music and, usually, is on the radio.

“唱片骑师”或“deejay”是播放音乐的人，通常是在收音机上。

A " jock" (jock) is a nickname, or a short name, for a disk jockey, which is another term for someone who has a radio program, usually someone who plays music but not always.

“jock” （jock）是disk jockey的昵称，或简称，是指拥有广播节目的人的另一种称呼， 通常是播放音乐但不总是播放音乐的人。