The student is engrossed in his book.
这学生正在专心致志地。
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He appeared as a mere parasite of the heath, fretting its surface in his daily labour as a moth frets a garment, entirely engrossed with its products, having no knowledge of anything in the world but fern, furze, heath, lichens, and moss.
他显得只是荒原上的一个寄生物,如同蛾子啃啮衣眼,他的日常劳作啃啮着荒原表面,他全神贯注于荒原的产物,除了蕨、荆棘、石南、地衣和青苔以外,什么都不知道。