求翻译：今天，我和妈妈去市里玩，车上人可真多呀，我和妈妈好不容易找了个落脚的地方，一个漂亮的姐姐将座位让给了我。“谢谢姐姐！”我连忙道谢。“不用谢，小弟弟！”姐姐露出了甜美的微笑，一股暖流涌遍我全身，莫非，我遇到了“天使姐姐”？是什么意思？

Today, my mother and I went to the city, people are so much, my mother and I managed to find a settled place, a beautiful sister gave up his seat to me. "Thank you sister! "Thanked I hurriedly. "No thanks, little brother! "Sister showed its sweet smile, a warm current surges over my whole body, coul