介绍兰州的英语作文可以从以下几个方面进行：

地理位置：

兰州位于中国西北部，黄河及其支流洮河交汇处。

历史文化：

兰州是甘肃省的省会，拥有超过2000年的历史。

自然景观：

兰州有美丽的五泉山和白大山，春天山上的冰雪融化，公园里的柳树和溪流相映成趣，山上的丁香花盛开。

气候特点：

春天温暖，夏天阳光充足，秋天凉爽，冬天寒冷且有飞雪。

现代发展：

兰州铁路像彩虹一样横跨黄河，连接着首都，现在是一个繁华且充满活力的城市。

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Lanzhou: A City of History and Natural Beauty

Lanzhou, the capital city of Gansu Province in northwestern China, is a city steeped in history and culture. Located at the confluence of the Yellow River and its tributary, the Zhuoye River, Lanzhou boasts a rich history that dates back over 2,000 years.

The city is renowned for its beautiful natural scenery, including the Wuqian Mountain and the Baida Mountain. In spring, the warm weather melts the snow and ice on the mountains, and walking in the park by the willows complements the streams. As the flowers of Dingding Mountain begin to bloom, the park becomes a fragrant paradise for many people.

Summer in Lanzhou is characterized by sunny days and yachts filled with shade, making it a popular season for outdoor activities. In winter, the north wind brings flying snowflakes, and while animals hide in their homes, children brave the cold to go ice skating and enjoy snowball fights.

Lanzhou is also a modern city with a developing infrastructure. The railway, like a rainbow across the Yellow River, connects the capital to other parts of the country. This has greatly improved the city's connectivity and economic prosperity.

In conclusion, Lanzhou is a city that combines the charm of history and the beauty of nature. Whether you are interested in culture, history, or simply enjoying the outdoors, Lanzhou has something to offer for everyone.

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希望这个作文示例能帮助你更好地介绍兰州。如果有任何需要修改或补充的地方，请随时告诉我。