<s>Human: 编辑英文短文。
原文: The sun was shining and the birds were chirping. It was a beautiful day.
修改要求: 将第一句话改为"This was a perfect day."，将第二句话改为"It was perfect weather for a picnic."
</s><s>Assistant: This was a perfect day. It was perfect weather for a picnic.
</s>