Even now he is dead, but he was also a useful knowledge of the world;ผลลัพธ์ (ภาษาอังกฤษ) 2:Even now he is dead, but he was also the knowledge that is useful to our world.ผลลัพธ์ (ภาษาอังกฤษ) 3:Even now he is dead, but he is still useful knowledge to our world.