她知道许多有关培根的轶事.She knows many anecdotes of Bacon.“ 实验, 实验 ”, 这就是罗杰,培根肩负的重担." Experiment, experiment ", that is the burden of Roger Bacon.培根是着名的散文家.Bacon was a famous essayist....
远在公元11世纪,中国已使用火药.Gunpowder was used in China as far back as the 11 th century.在14世纪上半叶,火药传入欧洲.Gunpowder was introduced into Europe during the first half of the 14 th century.他们正在把火药和武器搬进前舱.They are putting the powder and...