说笑声；摩擦声the sound of giggling; grating sound
孩子们在院里玩得很高兴，叽叽嘎嘎地笑着嚷着。
The children were playing happily in the courtyard, giggling and shouting.
织布机叽叽嘎嘎响个不停。
The loom grates incessantly.
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