This passage show the types of problems Chinese immigrants faced in the early 1900s in a sense that, the boys are throwing rocks at the narrator and his father because they are Chinese.
In Dragon wings by Laurence Yep is an adventurous novel for kids which describes or elaborate a story of a Chinese immigrants.
From the passage, we are able to work out the issues faced by the daddy and his son, on their every new trip they might come upon children or boys who treat them unwell by throwing rocks, and this was mainly due to this the son finds himself quite scared and familiar.
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