His voice dropped.
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his voice dropped
他的声音低了下来
以上为机器翻译结果，长、整句建议使用 人工翻译 。
His voice dropped to a whisper.
他的声音已放低到轻声细语了。
《牛津词典》
His voice dropped to a lower pitch.
他的声音降到较低的音调。
youdao
The Blue Man paused. His voice dropped.
蓝皮人又顿了一下，声音低沉下来。
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