假如你是李华，收到一封署名为David的网友的求助信．信中他向你诉说了自己的困扰：近日，他在学习中国文化时，在博客中看到了下面两幅图片，但对其含义不是很理解．请你用英语给他写一封回信做出解释．

写作要求：
1．信的开头和结尾已给出，但不计入总词数．
2．可以适当增加细节，以使行文连贯．
 3．词数不少于100．
4．参考词汇：对……孝顺 be dutiful to；美德 virtue；博客 blog
Dear David，
I'm glad to receive your letter and know you're learning the Chinese culture．

The pictures you have seen in the blog show the Chinese traditional virtue that the children should be dutiful to the parents．
In Picture One，a young father is washing feet for his old mother，setting a good example for his little son．And in Picture Two，the son who has grown up is helping his father by the arm，who has turned old．That's to say，the son is dutiful to his father as his father does to his mother in Picture One．
In my opinion，the pictures tell us that if we are dutiful to the old when we are young，our next generation will carry forward the fine tradition．
I hope my explanation can be helpful to you，and look forward to your reply．

The pictures you have seen in the blog show the Chinese traditional virtue that the children should be dutiful to the parents．
In Picture One，a young father is washing feet for his old mother，setting a good example for his little son．And in Picture Two，the son who has grown up is helping his father by the arm，who has turned old．That's to say，the son is dutiful to his father as his father does to his mother in Picture One．
In my opinion，the pictures tell us that if we are dutiful to the old when we are young，our next generation will carry forward the fine tradition．
I hope my explanation can be helpful to you，and look forward to your reply．

Yours Sincerely，
Li Hua