Viewpoint 1: the "small stool" clue plays a big role. ① "Small stool" appeared four times in the article, while "food delivery" appeared three times, and the plot of "small stool" was more specific. (2) The "small stool" runs through almost all the plots of the novel, such as the guards trying to confiscate the small stool, the prisoners helping to hide the small stool, Hans giving the small stool, and the Russian mother using the small stool, which makes the plot seamless. (3) In the form of expression, the "small stool" not only plays the role of structuring the plot, but also plays the role of conveying feelings with things, and places the deep friendship between the Han people and prisoners of war and the Russian mother.

Viewpoint 2: The "food delivery" clue plays a great role. (1) "Food" is the main clue in the novel, while "small stool" is the secondary clue. ② The plot of "Little Stool" comes from the main line of "giving food" and is a response to the kindness of Russian mother. (3) In the form of expression, "feeding" is a direct description, which directly shows the beauty of Russian mother's humanity.

Viewpoint 3: Both clues have played a great role. (1) The two clues are parallel to each other, and each clue is connected with its related plot, which constitutes the complete plot of the novel. (2) The two clues echo each other, which not only shows the charity behavior of Russian mother, but also shows Hans' grateful return, and expresses the theme of turning hatred into great love from the plot that runs through the two clues. (3) In the form of expression, the plot of "giving food" directly shows the virtue of the protagonist's Russian mother, while the plot of "small stool" indirectly shows her virtue from the side. (reasonable)