单词：sterically hindered phenol
单词：sterically hindered phenol 相关文章
A young man whose name was Pythias had done something which the tyrant Dionysius did not like. For this offence he was dragged to prison, and a day was set when he should be put to death. His home was far away, and he wanted very much to see his fath
英文童话故事
By VOA Sports Washington, DC 04 January 2008 The U.S. team of Mardy Fish and Serena Williams has beaten top-seeded Serbia to win the Hopman Cup mixed team tennis competition in Perth, Australia. It was the fifth time an American team has won the even
VOA标准英语2008年（一月）
By Noel King Khartoum 19 June 2006 Sudanese children collect water from a well in the village of Brikatouly in South Darfur, Sudan The top United Nations humanitarian coordinator in Sudan says that fighting among rebel factions is blocking humanitar
2006年VOA标准英语（六月）
Grimmette is taller and heavier that Martin, but Brian drives the sled - with Grimmette lying on top of him. The arrangement calls for a closeness of thought that would challenge even the best co-workers. It's a good thing they are friends as well. G
VOA标准英语2010年(一月)
BRUSSELS, May 31 (Xinhua) -- Baby bottles containing the substance Bisphenol A (BPA) would have to be pulled from the shelves across the European Union (EU) starting from Wednesday, in a milestone move to better protect the health of EU citizens, an
英语新闻
Tea has complex compounds called polyphenols which are believed to help the arteries to relax or dilate, thus enabling a smoother flow of blood. 茶中含有一种叫多酚的复杂混合物。这种物质据信能帮助放松或扩张动脉，从而使
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