Tetragraph
在密码中一连串的四个字母
🗣️ 情景例句
Hi, John, what's going on?
嗨，约翰，你都在做些什么事啊？
The darkest hour is that before the dawn.
黎明前是最黑暗的时刻。
who produced it with a flourish and pointed out a microscopic 'o' beside the time of the arrival of the train at his station;
站长拿着时刻表一挥手，指着那趟列车到站时刻旁边一个很小的圆圈标记。