First you hear the direct sound, then you hear the room reverberation.

首先你听到的是直达声音，然后你就听到了被延迟的混响声音了。

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The first wave that hits our ears is the direct sound which has travelled directly from the source to the listener.

两耳时间差异：当一个声波撞击一个人的头，需要不同的时间到达听者的左和右耳朵。

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When we use it to test the underwater target strength, one problem is how to discriminate the direct sound of the source with the echo reflected from the target, finding the target character quickly.

当利用它进行水下目标强度测试时，一个很实际的问题就是怎样区分声源直达声和目标反射回声，快速找出目标特性。

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Completed in just 10 days on a two-track machine, it takes his no-frills approach to recording to new heights - resulting in a refreshingly direct sound.

BBC: CD Review: Frank Black

Unlike "surround sound" speakers, 3D audio can precisely pinpoint up to eight people in a room and direct sound at each one individually by sending separate signals to each ear, so that each person no longer has the awareness that sounds are coming at them from specific speakers.

BBC: 3D audio may revolutionise travel

Turn on the system, and the speaker automatically tilts out to pre-set angles to direct the sound for optimal listening.

ENGADGET: Bang & Olufsen launches BeoLab 15 in-wall speakers for stealthier beats (update: ears-on)