核心问题
副词 sound 与副词 soundly 有何异同？
词典解答
副词 sound 主要与 sleep 和 asleep 搭配使用,此时亦可使用 soundly(意为 deeply):
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He was lying in bed, sound asleep. 他躺在床上，睡得很熟。
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He was sleeping sound. 他正在熟睡。
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I slept very soundly, thank you — the bed was really comfortable. 我睡得很熟，谢谢你——这床真舒服。
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If you sleep sound(ly), you sleep deeply ... 如果你睡得 soundly,那就是你睡得很香甜……