《汉书·传·外戚传下》
成帝说： 我发誓册立赵氏，所以废掉了许氏。
帝曰： 约以赵氏，故不立许氏。
Emperor Cheng said: I made an oath to establish Zhao as the empress, so I废掉了许氏.
<s>[INST] Convert the following English text into Classical Chinese: Emperor Cheng said: I made an oath to establish Zhao as the empress, so I废掉了许氏. [/INST] 帝曰： 约以赵氏，故不立许氏。</s>
Convert the following English text into Classical Chinese: Emperor Cheng said: I made an oath to establish Zhao as the empress, so I废掉了许氏.
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帝曰： 约以赵氏，故不立许氏。
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