n. 信号；动机（signal 的复数）；标志
v. 表示（signal 的第三人称单数）；发信号
communication signals通信信号（communication signal的复数形式）
signals and systems信号与系统
1.They fired three distress signals.
他们发射了3次遇难求救信号。
2.Callahan posits that chemical elements radiate electromagnetic signals.
卡拉汉假定化学元素放射电磁信号。
3.The signals were coming through!
信号来了！
4.Signals are made with flags or lamps.
信号是用旗或灯发出的。
5.When submerged, they're also able to emit signals from depths of 20,000 ft.
潜入水中后，它们仍能从2万英尺深处发射信号。
6.About 60,000 subscribers have special adapters to receive and decode the signals.
大约60000用户有专用适配器来接收和转换信号。
7.To test how responsive dolphins are to various signals.
测试海豚对各种信号的反应。
8.The crew did not send out any distress signals.
机组人员没有发出任何求救信号。
9.From signals sent by the receptors, the brain understands smells as complex spatial patterns.
通过受体发出的信号，大脑将气味理解为复杂的空间图案。