《后汉书·本纪·孝安帝纪》
六月二十八日，河东地陷。
六月丁巳，河东地陷。
On 28 June, there was a great land subsidence in Hedong.
<s>[INST] Explain the meaning of this Classical Chinese passage in English: 六月丁巳，河东地陷。 [/INST] On 28 June, there was a great land subsidence in Hedong.</s>
Explain the meaning of this Classical Chinese passage in English: 六月丁巳，河东地陷。
user
On 28 June, there was a great land subsidence in Hedong.
assistant