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He kept his voice low-pitched in case someone was listening.
他压低声音，免得旁人听见。
《柯林斯英汉双解大词典》
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Can you explain to me what the difference is between a high-pitched and low-pitched voice?
你能跟我解释一下高音和低音的区别吗？
youdao
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Can you explain to me what the difference is between a high-pitched and low-pitched voice?
你能跟我解释一下高音和低音的区别吗？
youdao