改错The Bunsen burner is so named because it is thought to be invented bu Robert Bunsen,who was GerThe Bunsen burner is so named because it is thought to be invented bu Robert Bunsen,who was German by birth.
改错The Bunsen burner is so named because it is thought to be invented bu Robert Bunsen,who was GerThe Bunsen burner is so named because it is thought to be invented bu Robert Bunsen,who was German by birth.
改错The Bunsen burner is so named because it is thought to be invented bu Robert Bunsen,who was Ger
The Bunsen burner is so named because it is thought to be invented bu Robert Bunsen,who was German by birth.
改错The Bunsen burner is so named because it is thought to be invented bu Robert Bunsen,who was GerThe Bunsen burner is so named because it is thought to be invented bu Robert Bunsen,who was German by birth.
to be invented-to have been invented
The Bunsen burner was so named because it was thought to be invented by Robert Bunsen,who was German by birth.