立秋，秋季的第一个节气，是夏季结束、秋季开始的标志。在这一天，天气渐渐变凉，人们开始感受到秋天的气息。以下是一些适合用作立秋文案短句的英文：

1. "The first solar term of autumn has arrived, and the cool breeze of autumn is blowing. Happy Liqiu!"

2. "With the arrival of Liqiu, the scorching heat of summer is gradually fading away, and the crisp autumn air is taking over."

3. "As Liqiu approaches, it's time to say goodbye to the sweltering summer and welcome the refreshing autumn breeze."

4. "Liqiu marks the beginning of autumn, a season of change and harvest. Embrace the new season with open arms!"

5. "With the arrival of Liqiu, it's time to enjoy the cool weather, savor the fruits of autumn, and cherish the beauty of nature."