来回性杂音

【医】 seesaw accentuated; to-and-fro accentuated

来回的英语翻译：

back and forth; come-and-go; make a round trip; to and fro

杂音的英语翻译：

cacophony; noise; souffle
【化】 unpitched sound
【医】 murmur; souffle; susurration; susurrus