1. Early next morning, she heard planes passing overhead and wondered how she could send a signal.
    第二天清晨，她听到头上有飞机飞过，却不知道怎样才能发出信号，

2. Early next morning, she heard planes passing overhead and wondered how she could send a signal.
    第二天一大早，她听到头顶上有飞机飞过，但不知道怎样才能发个信号。

3. But we are the ones who signal to businesses that what they are doing is okay — every time we buy their products.
    每当我们购买他们的产品时，我们就在向企业发出信号，告诉他们可以这样做。

4. By installing optical fiber, digital switches, and the latest wireless transmission systems, a parade of urban centers and industrial zones from Beijing to Budapest are stepping directly into the Information Age.
    由于安装了光纤电缆、数字转换器和最新的无线传输系统，从北京到布达佩斯的一系列城区和工业区正在直接跨入信息时代。

5. By the end of 1995, each of China's provincial capitals except for Tibet will have digital switches and high-capacity optical fiber links.
    到1995年底，中国除了西藏以外的省会都将有数字转换器和高容量的光纤网。

6. Was it the signal?
    这是那信号吗?

7. The soldiers lay in ambush, waiting for the signal to open fire.
    士兵布下伏兵，等待开火的信号。

8. The pilot must command a collection of lights, dials, knobs, digital displays, and other electronic devices.
    驾驶员必须能控制一整套设备，包括机灯、仪表盘、手柄、数字显示器和其他电子设备。

9. To further reduce the waiting list for phones, Hungary has leased rights to a Dutch -Scandinavian group of companies to build and operate what it says will be one of the most advanced digital mobile phone systems in the world.
    为进一步减少电话待装户，匈牙利已将权利出租给一家荷兰-斯堪的纳维亚企业集团，来建造并经营一个据说是世界上最先进的数字移动电话系统。

10. Don't be alarmed by the bells ringing in Singaporean taxis, which are simply a signal warning drivers they have exceeded the speed limit.
    坐在新加坡的出租车里，不要被铃声吓着，那只是个信号，警告司机车已经超过限制速度了。