4.0信号-光和声音
Section outline
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People also use devices to communicate (send and receive information) over long distances.
::人们还使用设备进行长距离通信（发送和接收信息）。
A driver is stopped at a stoplight.
He waits for the light to turn green.
The driver looks to his right.
He sees an interesting store.
Honk, honk, is the sound heard from behind.
Why would another driver beep their horn?
::一名司机在红灯前被拦住了。他等着绿灯亮。司机向右看。他看到一家有趣的商店。喇叭，喇叭，是从后面听到的声音。为什么另一个司机会按喇叭？
The sound is a signal.
The driver of the car wants to move.
The driver of the first car looks up.
The light has turned green.
He steps on the gas pedal.
The car moves forward.
The driver now needs to turn left.
What do you think he will do to signal the left turn?
::声音是一种信号。汽车的司机想要移动。第一辆车的司机抬起头来。绿灯变绿了。他踩下了油门。汽车向前行驶。司机现在需要向左拐。你认为他会做什么来示意左转？
The driver comes up to the next intersection.
He turns on his blinker.
The light blinks on and off.
It tells other drivers which way the car will be turning.
It is another way to send signals.
::司机来到了下一个十字路口。他打开了他的闪光灯。灯忽亮忽灭。它告诉其他司机汽车将向哪个方向转弯。这是另一种发送信号的方式。
As the driver eases up to the next intersection, the light
turns red.
The driver knows to stop.
How do the lights on a traffic signal tell a driver what to do?
::当司机慢慢开到下一个十字路口时，红灯亮了。司机知道该停车。交通信号灯如何告诉司机该做什么？
The traffic lights change to green.
This tells car drivers to move their car forward.
Red lights tell drivers to stop.
Yellow are a warning.
Drivers may need to stop.
::交通灯变成了绿色。这告诉司机把车往前开。红灯告诉司机停车。黄色是警告。司机可能需要停车。
Traffic lights give information.
They talk to us but don’t say a word.
Drivers signal to each other.
They too do not have to speak.
What are ways drivers signal each other.
::交通灯提供信息。他们跟我们说话，但一句话也不说。司机们互相发信号。他们也不需要说话。司机互相打信号的方式是什么？
Drivers can honk their horn.
Horns get people’s attention.
It may mean, please move.
It could mean please notice me.
::司机可以按喇叭。角能引起人们的注意。它可能意味着，请移动。它的意思是请注意我。
Cars also talk to people.
Ding, ding, ding means buckle your seatbelt.
Click, click, click means your blinker is on.
Lights on the dash give us warnings.
Check your tires.
Check your oil.
All are warning lights.
::汽车也会和人说话。叮，叮，叮的意思是系好安全带。点击，点击，点击意味着你的闪光灯亮了。仪表板上的灯发出警告。检查你的轮胎。检查你的机油。都是警示灯。
Light and sound can be used to signal.
Police cars have loud sirens.
Sirens tell us to move out of the way.
Police cars also have flashing lights on top of them.
Both sound and light are great ways to signal.
::光和声音可以用来发信号。警车有很大的警报器。警笛让我们让开。警车的车顶也有闪光灯。声音和光线都是传递信号的好方法。
There are many ways we use light and sound to signal when
we drive cars.
What are some other signals you can think of?
::当我们开车时，我们有很多方法使用光和声音来发出信号。你还能想到其他的信号吗？
