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- In telephony, the use of tones to transmit supervisory, address and alerting signals over a circuit. 在电话技术中，利用音调在电路中传送监控、地址和报警信号的做法。
- One should not run about aimlessly during an alert. 空袭警报期间不可到处乱跑。
- She is always on the alert for some new calamity. 她总是保持警觉以防某种新的灾难。
- Keep on the alert; we're due for an inspection. 提防着点，轮到检查我们了。
- Be sure to be watchful or alert. 必须留神，千万要提防。
- A red light is usually a signal of danger. 红灯通常是危险的信号。
- The study of the alert signal processing technique in IP network management system IP网络管理系统中的告警管理技术
- They have put the army on the alert. 他们已使军队进入戒备状态。
- The alert leopard went up to a deer quietly. 警觉的豹子静悄悄地走近一只鹿。
- I stood watching for the signal to change to green. 我站着等待交通信号转为绿灯。
- An alert listener will have noticed the error. 耳朵尖的人能听出这个错。
- Let's set the clock by the radio time signal. 咱们照着收音机的报时信号把钟对一对。
- A red lamp is often a danger signal. 红灯常常是危险的信号。
- A reflected signal on a communication channel. 一种在通信信道上反射回来的信号。
- The rise in prices was a signal for rebellion. 物价上涨引起了叛乱。
- The district was put on red alert during a terrorist bomb scare. 这个地区在得到恐怖主义者轰炸后作了应急准备。
- Alert to circumstances; attentive. 对周围环境敏感的; 留心的
- A channel over which pilot signal is transmitted. 可在其上传输导频信号的一种信道。
- Troops are on the alert against any possible aggression. 军队戒备着可能的来犯。
- The signal was picked up by a downrange radar station. 该信号被试验飞行方向之内的雷达站收到了。
