Thomas Edison was one of the greatest inventors in the world.爱迪生是世界上最伟大的发明家之一.Inventors were John Bardeen, Walter Brattain and William Shockley.发明者包括约翰.巴丁, 沃尔特.布拉顿和威廉. 肖克利.Inventors are now working on steam cars as well ...
They believe that the humic materials are leached from decaying plant materials.他们认为腐植物料是从腐烂的植物体浸沥而来.Humic acids are usually regarded as polymers of aromatic compounds.腐殖酸通常被看作是芳烃化合物的聚合物.Humic substances are known to coa...