| 释义 |
🔑signalsig·nal1 /ˈsɪɡnəl / noun [countable] - a sign, an action, or a sound that sends a particular message信号；暗号◆The army waited for the signal to attack.部队等待进攻的信号。◆The flag went down as a signal for the race to begin.旗子放倒是比赛开始的信号。
- a set of lights used to tell drivers when they should stop or go信号灯；指示灯◆a traffic signal交通信号灯 ➡ look at turn signal
- (
physics物理) a series of radio waves, etc. that are sent out or received（电波）信号◆a signal from a satellite卫星传来的信号
🔑signalsig·nal2 /ˈsɪɡnəl / verb [intransitive, transitive] (sig·nal·ing, sig·naled) (CanE -ll-) to make a signal; to send a particular message using a signal发信号；示意◆She was signaling wildly that something was wrong.她拼命打着手势示意出问题了。◆He signaled his disapproval by leaving the room.他离开房间以示反对。◆The police officer signaled to the driver to stop.警察示意司机停车。 |