她用舌头抵着上腭发出咔哒声。
他太害怕了，以至于也开始相信自己听到了他们的电话发出的奇怪的咔哒声。
He was so spooked that he, too, began to believe that he heard strange clicks and noises on their telephones.
他舌头动来动去发出咔哒声来。
He started to make clicking (咔哒) sounds with his tongue (舌头) to help him move around.
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