echo

• 指声音碰到表面反射回来而再次听到的现象，也指对某事物的重复或模仿。

A noun referring to a sound that is reflected off a surface and heard again, or a repetition or imitation of something.

1. Sound reflectionA2formal

   A sound that is reflected off a surface and heard again after the original sound.

   回声

   • The echo of his voice bounced off the canyon walls.
   • She shouted into the cave and heard her echo return.
   • The echo in the empty hall made the music sound eerie.

   同义词re-echoreflectionrepetitionresonancereverberationringing

2. Repetition or imitationB2formal

   Something that repeats or reflects an idea, opinion, or event.

   回响或重复

   • His speech was an echo of the president's earlier remarks.
   • The new policy is an echo of past failed attempts.
   • Her laughter was an echo of her mother's.

   同义词copyimitationmirrorreflectionreminderrepetitionreplicaresonancereverberationtrace

   反义词innovationnoveltyoriginal

3. Technical signalB2formaltechnical

   A reflected signal in radar, sonar, or ultrasound technology.

   回波

   • The radar detected an echo from the approaching aircraft.
   • Sonar uses sound echoes to map the ocean floor.
   • The ultrasound machine processes echoes to create images.

   同义词backscatterreflectionreturn

• 动词，表示声音的回荡或反射，也指重复或模仿他人的话或行为。

A verb used to indicate the act of repeating or reflecting a sound, or to imitate or repeat someone's words or actions.

1. Repeat soundA2formal

   To repeat a sound due to the reflection of sound waves.

   发出回声

   • The sound of his footsteps echoed through the empty hall.
   • Her voice echoed in the canyon.
   • The gunshot echoed across the valley.

   同义词resonateresoundreverberatering

2. B2formal

   To repeat or imitate what someone else has said or done.

   重复或模仿

   • The child echoed her mother's words.
   • His speech echoed the sentiments of the entire community.
   • The article echoes the opinions of many experts.

   同义词copyimitatemimicmirrorparrotreflectrepeatreproduce

   反义词innovateoriginate