Rach
abbr. 随机接入信道（Random Access Channel）
🗣️ 情景例句
John is tied up at the present time.
John现在有事。
People go to visit their parents, relatives and friends.
人们出门探望父母、亲威和朋友。
A talk? What subject should I talk about?
吉姆，讲话？我能讲什么题目呢？