To mutter to oneself; to murmur to oneself; to talk to oneself in a low voice.
她独自坐在公园长椅上，喃喃自语，似乎在回忆着什么。
She sat alone on the park bench, muttering to herself, as if recalling something.
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To mutter to oneself; to murmur to oneself; to talk to oneself in a low voice.