意译也无妨，大致准确即可。先谢谢了！
It also reveals the relationship between the two sisters. All of Jane’s experiences in London are conveyed through this letter. Jane finally admits that she was right about the insincerity of Caroline Bingley’s friendship, although, as usual, she makes excuses for her inattention saying that she must only be acting so rudely for the sake of her brother. Here, instead of giving us a long narrative about Jane’s stay in London, Austen beautifully condenses her entire stay into a succinct letter giving the reader a comprehensible picture. Jane Austen avoids dialogue by using the letter instead in providing important information to the reader. Thus, the letter plays an important role in furthering the plot.

这也展现了两姐妹间的关系。简(女子名)在伦敦所有的经历都通过这封信体现出来了。简最后认为自己对凯若琳伪善的友情是对的，尽管像平常那样，她为自己粗心找借口并说做得如此粗鲁仅仅是为了她哥哥的缘故。这里，没有给我们讲关于简在伦敦时的长长的故事。珍.奥斯汀（英国女小说家）完美地把整个故事浓缩成一封简洁的信，留给读者一个易于理解的空间。珍.奥斯汀通过信把重要的信息传递给读者（避免通过对话）。从而 ，那封信在进一步推进情节方面起到了重要作用。