sustained sound
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地震之前有一声巨响，持续了20秒钟。
The earthquake was preceded by a loud roar and lasted 20 seconds.
《柯林斯英汉双解大词典》
每一声“尖叫”仅仅持续0.05秒。
Each "scream" lasts for just 0.05 seconds.
And perhaps the explanation has got to be the ubiquity of death is this kind of background, constant hum.
也许应该这么解释，死亡的无处不在,是一种背景的，持续的嗡嗡声。
耶鲁公开课 - 死亡课程节选
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