Now, coumarin is a very common thing, a material, in fragrance which is derived from a bean that comes from South America. 香豆素是香水中一个十分平常的原料，从来自南美的豆子中提炼出来的。 And it is the classic synthetic aroma chemic
When I was growing up, 虽然我已经长大 But it was still a joy and a wonder to me. 我还是对它很好奇，觉得它很有趣 You had skyscrapers and 它具有摩天大楼 you had all of this hidden energy. 和所有这些隐藏的能量 Just walking around,you could fe
December 10, 2007 THE PRESIDENT: Just had an extraordinary meeting with Jewish men and women, many of whom are from different parts of the world, who are fortunate to call America home, and they do so
The firm Ennead clad the Utah Natural History Museum in Salt Lake City in copper and zinc, Ennead公司用铜和锌包裹了位于盐湖城的犹他自然历史博物馆， ores that have been mined in the area for 150 years and that also camouflage
Press Briefings April 06, 2010 | 53:45 White House Press Briefings are conducted most weekdays from the James S. Brady Press Briefing Room in the West Wing. Public Domain The White House Office of the
