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
Speaking of promoting the book,
说起促销书的事
Don't rush me.
别催我!
In their efforts to persuade us to buy this or that product, advertisers have made a close study of human nature and have classified all our little weaknesses.