本文介绍了一种带声功回收的脉管制冷机，从功回收和相位调节角度对它进行了分析。

This paper introduces a kind of pulse tube regenerator, which can recover part of the lost acoustic power, and then analyzes it in two aspects:acoustic power recovery and phase angle adjustment.

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在一段似乎永无休止的静音后，从带中听到了钥匙碰撞的叮当声。

After a seemingly unending silence, the sound of keys jingling is picked up by the recorder.

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