It is caused by the Doppler effect (something similar happens when a police car or fire engine with its siren blaring drives past you, and the pitch of the sound suddenly drops).
这是由多普勒效应(类似一辆警车或消防车鸣着警笛从你身边经过，之后音高突然下降)引起的。
The Doppler effect is used to discover extrasolar planets.
都卜勒效应通常用于探索太阳系外行星。
The characteristic, transmission model of 3d Virtual Sound is introduced. The Doppler effect is discussed.
介绍了三维虚拟声音的特性、传播模型，分析了多普勒频移的原理和效应模型。
With the laser scanning vibrometer, based on the Doppler effect, the muzzle vibration velocity is measured.
炮口振动速度测试可以采用激光测振仪，它是基于多普勒原理的激光非接触测振技术而研制的。
Explore the Doppler effect in a binary pulsar system by downloading the "Pulsating Science" 3d visualisation software.
您可以下载一款名为“PulsatingScience”的3维可视软件来探索脉冲双星系统中的多普勒效应。
The Doppler effect is widely used in astronomy for measuring the velocity at which distant stars or nebulae are approaching or receding.
多普勒效应在天文学上广泛应用于测量距离遥远的恒星或星云靠近我们或离开我们速度。
Once someone passes, based on the Doppler effect, the frequency of the signals reflected by the moving body is different from the signals transmitted.
如果有人通过，由运动人体返回的超声信号会因为多普勒效应而产生频率偏移。
Embolic detection can be used for early diagnosis of cerebrovascular disease. The Doppler effect of ultrasound is a non-invasive means for the detection of emboli.
血栓的准确检测可以用于早期脑血管疾病的诊断，超声多普勒是一种无损的血栓检测技术。
Pulse Doppler radar is a new type of radar which uses the Doppler effect due to the relative movement between the object and the radar to measure the velocity of the object.
脉冲多普勒雷达是利用目标与雷达之间相对运动产生的多普勒效应实现测速功能的一种新型雷达。
We accordingly propose to take the marginal decay curve (whose function is simple) as a criterion to check if an observed pulse could be taken as a candidate suffered from the Doppler effect.
于是我们提出把极限衰减曲线作为检验观测脉冲是否是多普勒效应作用下的结果的一个标准。
We accordingly propose to take the marginal decay curve (whose function is simple) as a criterion to check if an observed pulse could be taken as a candidate suffered from the Doppler effect.
于是我们提出把极限衰减曲线作为检验观测脉冲是否是多普勒效应作用下的结果的一个标准。
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