
好词典

Named after Austrian physicist Christian Doppler, who first described the phenomenon in 1842.
❶ 多普勒效应,指当波源与观察者相对运动时,波的频率会发生变化的现象,常见于声波和光波。
“The Doppler effect explains why a siren sounds higher as it approaches you.”
(多普勒效应解释了为什么警笛声在接近你时听起来更高。)
“Astronomers use the Doppler shift to measure the speed of stars.”
(天文学家利用多普勒频移来测量恒星的速度。)
Doppler radar — 多普勒雷达,一种利用多普勒效应测量物体速度和位置的雷达技术,常用于气象和航空领域。
“The weather station uses Doppler radar to predict severe storms.”
(气象站使用多普勒雷达预测强风暴。)
Doppler ultrasound — 多普勒超声,一种医学成像技术,利用多普勒效应检测血流速度和方向,常用于孕期检查和心血管诊断。
“The Doppler ultrasound showed normal blood flow in the patient's arteries.”
(多普勒超声显示患者动脉中的血流正常。)