Brief analysis: The sentence "Being a stranger alone in a foreign land" uses one word of "independence" and two words of "dissimilarity", which are full of weight. My thoughts about my loved ones and my feelings about my lonely situation are all condensed in the word "independence". "Being a stranger in a foreign land" only refers to being a guest in another country, but the artistic effect caused by the word "different" is much stronger than that caused by the general description of being a guest in another country. A stranger's homesickness naturally exists on weekdays, but sometimes it doesn't necessarily show up, but once it encounters some kind of catalyst-the most common one is "festival"-it is easy to explode and even uncontrollable. This is the so-called "I miss my relatives twice during the festive season".