他声音非常深刻
He had a very deep voice
以上为机器翻译结果，长、整句建议使用 人工翻译 。
用温和平静的声音解释，如果他能够遵守纪律的话你会印象深刻。如果他能够严于律己，你将非常感激。
In a soft, calm voice, explain that while you are impressed with how well he is following the plot, you'd appreciate it if he'd keep his observations to himself.
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