问题: 翻译his voice breaking
I've already explained to you," the officer told him, "that a fourteen-year-old is not allowed to withdraw money without a letter from his parents."
"But that doesn't seem fair," the boy said, his voice breaking. "It's my money, I put it in. It's my account."
请翻译并解释：his voice breaking
解答:
his voice breaking
他的声音嘶哑了
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