判断一份英文文章的难易程度，并提出改进建议。
英文文章: 
The quick brown fox jumps over the lazy dog. This sentence is often used for testing typewriters and computer keyboards because it contains every letter of the English alphabet. However, it is not a very interesting sentence.
这篇文章的难易程度不高，适合英文初学者，但如果想提高文章的语言水平，可以加入更多的细节和情感，使其更加生动有趣。同时，可以探讨使用这个句子进行测试的历史和文化背景。