Go-ahead tone
[计] 先行音信号, 响导信号
🧩 词语组成解析
go
[go]
vi. 走;离开;去做;进行;
vt. 变得;发出…声音;成为;处于…状态;
n. 轮到的顺序;精力;干劲;尝试;
tone
[təun]
n. [语]声调，语调;[画]色调，色泽，明暗;[乐]乐音，全音，全音程;[医]（正常的）健康状态;
vt. 使更健壮;定调;使变调子;[摄影术]给…上色;
vi. 带有某种腔调;呈现某种色彩;（颜色）调和（与 with 连用）;
🗣️ 情景例句
Don't open the door if you don't know who it is.
如果有陌生人敲门不要开门。
What time is the mail delivered on Saturday?
邮件在星期六什么时间被递送？
I supposed him to be very clever but he was in fact a fool.
我以为他很聪明，其实他是个蠢货。