n. 信号,暗号;预兆,征象;动机;导火线;
vt. 向…发信号;用动作(手势)示意;以信号告知;
vi. 发信号;
adj. 显著的,优越的;暗号的,作信号用的;
sign记号,信号+al表名词 → 信号
🗣️ 情景例句
Huh.
哦。
Flirt!
花痴!
If you want to send a letter to an office abroad that is in a different time zone, you can send a fax, and it will be received even though the office is not open.