Peter F. answered 05/29/20
Published Author; Kinder-College English Tutor w/ 18 Years' Experience
Hello Stan,
The first underlined sentence is transitional because it segues to literary comparisons drawn between the success stories in the Chinese books and other success stories in American writing (in this case, with the biography of the late Steve Jobs being the written work and Walter Isaacson being the given book's author).
The second underlined sentence is transitional because it contrasts the dominant outlook of modern independent publishers to the challenges that those same literary establishments face in the process of achieving their success.
In the case(s) of both underlined sentences, what makes them transitional is that they are changing the topic of discussion slightly to either elaborate upon the given topic, or shift gears and focus on the content from another angle.
I hope this helps! Feel free to reach out with any further questions you may have.