他们不得不在隧道入口处安置一名信号员站岗。
信号员挥动着他受欢迎的小旗，火车司机愉快地鸣笛作为回答，火车驶出了车站。
The guard waved his welcome flag, the engine-driver whistled in cheerful response, and the train moved out of the station.
这艘船上的信号员用旗语向另一艘船发送好消息。
The signalman on the ship wigwagged the good news to the other ship.
信号员必须确保使用正确的信号， 保证起重机 动作安全。
Signalman should coordinate to ensure Safe Lifting Operation with proper signals.
当所有的坚果都被拿走了的时候，观察员需要发出信号。
The person watching is asked to signal when all the nuts have been removed.
斯威加特说：“当他们看到这邮递员重返街头时，这是生活开始恢复正常的第一个信号。”
"When they see that carrier back out on the street, that's the first sign to them that life is starting to return to normal," Swigart says.
根据研究员桑尼·松皮的说法，狗也许已经学会了检测来自人类的威胁信号，并且通过努力讲和来回应。
Dogs may have learned to detect threat signs from humans and respond by trying to make peace, according to researcher Sanni Somppi.
佛罗里达大西洋大学的研究员亚历克斯·斯特瓦诺维奇说：“自适应信号可以确保现有的交通需求得到解决。”
"Adaptive signals can make sure that the traffic demand that is there is being addressed," says Alex Stevanovic, a researcher at Florida Atlantic University.
有许多出纳窗口的银行经常使用电子信号来指示下一个空闲出纳员的位置。
A bank with many teller Windows often USES electronic signs to indicate the location of the next free teller.
然后，这些信号被一个操作员一个操作员地传递下去，直到抵达一个网络正常的区域。
These signals are then broadcast from operator to operator until they reach a network member in an area where the Internet functions.
利用这些信息，“信号专家”就可以计算出一个区域的交通灯时刻表，并为驾驶员建议可供参考的行驶速度，避免在交通路口遭遇红灯。
Using this information, SignalGuru is able to calculate the traffic-light schedule for the region and suggest the speed at which a driver should travel in order to avoid running into red lights.
所有的船上都携带着一种小仪器，它向卫星发送信号，使卫星能够始终监视渔船，而且每艘船可能每年两次携带检查员出海。
Gadgets carried on all vessels send electronic signals to make satellite monitoring possible at all times, and each boat is likely to go to sea with an inspector aboard twice a year.
下面让我们来看一种程序员经常会遇到的、由信号引起的错误的调试方法。
Now let's explore a way to debug a failure generated by a signal that programmers see frequently.
因此，懒惰的程序员可能比较喜欢将进程置为不可中断模式的睡眠状态，因为信号不会唤醒这类任务。
So a lazy programmer might prefer putting the process into uninterruptible sleeping mode because signals do not wake up such tasks.
有一个折衷的模式，即汽车基于输入扫描器和摄像头的信号判断，自行驾驶，只需要驾驶员在十字路口进行操控。
The compromise is a mode that has the car driving on its own, basing its decisions on input from scanners and cameras, and only requires the driver to give guidance at crossroads.
“收获者”执行飞行作战任务时，导航员既失去了对无人机的“实际控制”，也不能与遥控飞机建立联系并发送控制输入信号。
The Reaper was flying a combat mission when operators lost "positive control" of the UAV, or the ability to establish connections and send control inputs to the remote-controlled aircraft.
多巴胺属于大脑化学物质家族的一员，它们传递神经元之间的信号。
Dopamine is one of a family of brain chemicals that transmit signals between neurons.
“周一，吃饭的时候可能感觉不到饱，因为大脑没有接收到信号。”研究员德博拉·克莱格说。
"On Monday, you probably won't feel full when you eat, since the brain isn't getting the signals," says researcher Deborah Clegg.
然后，操作员就会重新把信号再次转换为电脑可以处理的信号，通电子邮件的形式发布到互联网上。
This operator reconverts the signal into computer-readable data and then e-mails or posts the information online.
乘务员就会在驾驶舱前拉开一道屏障，然后给我们发送一个无人信号才能使用。
The attendants set up a barrier to the cockpit and give us an all-clear signal to open the door, as we don't have a separate bathroom and have to use the same one as everyone else.
美国宇航局表示，预测人员估计太空碎片将于4点21分经过空间站，宇航员们在约两小时之前的2点41分收到警报解除信号。
The crew was given the all-clear signal at 2:41 p.m., NASA said, less than two hours before the 4:21 p.m. estimate officials had given for when the debris was expected to pass by the station.
美国宇航局表示，预测人员估计太空碎片将于4点21分经过空间站，宇航员们在约两小时之前的2点41分收到警报解除信号。
The crew was given the all-clear signal at 2:41 p.m., NASA said, less than two hours before the 4:21 p.m. estimate officials had given for when the debris was expected to pass by the station.
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