The Cao family went to bed early, he would be through with his work soon after nine. Sitting alone in his room or in the courtyard, he would mull over these two problems of his.

• 曹宅睡得很早，到晚间九点多钟就可以没事了，他独自坐在屋中或院里，翻来复去的想，想的是这两件事。