| 1. | Television signals can only be beamed in straight lines .
电视讯号只能以直线发射。 |
| 2. | It also provides indication when direct risk is imminent .
危险临近时，它也能发出讯号。 |
| 3. | Much as bats do, robots send out ultrasonic signals .
机器人就象蝙蝠那样地发出超声波讯号。 |
| 4. | Signals would then be recorded without the least distortion .
这样记录的讯号就一点儿也不会失真。 |
| 5. | A telegraph can transmit two different signals: a dot and a dash .
一台发报机可发射两种讯号：点和线。 |
| 6. | Other proportional feedback signals are generated from rate gyros .
其他的比例反馈讯号是由速率陀螺产生的。 |
| 7. | There may be a "black out" of radio signals over a large area for several hours .
在大面积上的无线电讯号可能发生数小时的停顿。 |
| 8. | All of these signals are gainadjusted, filtered and summed in an analog control computer .
所有这些讯号在模拟控制计算机中进行增益调整、滤波和综合。 |
| 9. | The longer wavelengths of radio signals pass through the atmosphere relatively undisturbed .
相对地说来，波长较长的射电讯号在通过大气时并没有受到干扰。 |
| 10. | The delay in radar signals mentioned above has been referred to as a fourth test of general relativity .
上面提到的雷达讯号的延迟被称为广义相对论的第四个检验。 |
