《晋书·志·第十九章》
吴孙权嘉禾三年九月初一，降霜伤害谷物。
吴孙权嘉禾三年九月朔，陨霜伤谷。
October 15, 250 AD, there was a frost that damaged the grain.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 吴孙权嘉禾三年九月朔，陨霜伤谷。 [/INST] October 15, 250 AD, there was a frost that damaged the grain.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 吴孙权嘉禾三年九月朔，陨霜伤谷。
user
October 15, 250 AD, there was a frost that damaged the grain.
assistant