名词
中文翻译：持续的声音
同义词：
['persistent sound', 'continuous sound']
例句：
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1.The music was so loud that it could not be heard clearly.
音乐太响了，听不清楚。
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2. The speaker continued to speak until the end of the meeting.
演讲者一直讲到会议结束。
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3. The baby's cries were a sustained sound that woke everyone up.
婴儿的哭声是持续的，把每个人都吵醒了。