"低沉连续的声音" can be translated into English as "a low, continuous sound" or "a deep, uninterrupted noise", depending on the specific context and nuance you want to convey.
"A low, continuous sound" emphasizes the deep pitch and unbroken nature of the noise.
"A deep, uninterrupted noise" also conveys a similar meaning, with "uninterrupted" highlighting the continuous aspect.
Both expressions are commonly used to describe sounds that are low in pitch and persist without interruption.