Khác biệt giữa bản sửa đổi của “Harry Potter dành cho Muggle/Truyện/Hoàng Tử Lai/Chương 9”

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Dòng 47:
Harry will continue searching for hints to the Half-Blood Prince's identity. At Christmas he discovers that the book was printed some fifty years before, which he believes rules out that it may have belonged to his father. Actually, the Half-Blood Prince attended school when Harry's father and mother were there, though, as a poor student, he was unable to afford new books and purchased second-hand. It is curious, perhaps, that Harry fails to consider the possibility that used textbooks can be purchased, even though he saw that second-hand books were bought for Ginny [[Muggles' Guide to Harry Potter/Books/Chamber of Secrets/Chapter 4|some years before]].
 
In fact, this used textbook becomes a large plot device throughout the book, with Harry constantly consulting it in Potions class, and thereby becoming one of Slughorn's best students. Additionally, Harry will find amany number ofother unrelated magical spells in the book's margins, and will make use ofusing them through the year. Hermione is never entirely happy with Harry using the book's spells, unsure what their provenance is; her worries eventually prove somewhat valid as Harry will discover the very darkDark [[Muggles' Guide to Harry Potter/Magic/Sectumsempra|Sectumsempra]] spell in the book, using it with no clue as to its effect.