他突然感到膝盖一阵刺痛，差点摔倒。
He felt a sudden ___twinge in his knee and almost fell.
他弯腰时突然感到背部一阵刺痛。
He felt sharp ___twinges in his back when he bent down.
她感到一阵内疚，因为没能参加母亲的生日派对。
She felt a ___twinge of guilt for missing her mother's birthday party.
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