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
In the farmer suitacle industry, the ability to simulate the interaction of chemicals, and do it in the computer rather than in test-tubes and Petri dishes, can speed up by years the discovery and tes
President Bush Congratulates President Uribe of Colombia on Hostage Rescue THE PRESIDENT: Yesterday I had the opportunity to speak to President Uribe of Colombia, and he called to give me the good new
Good morning,honorable judges,ladies and gentlemen! 早上好,尊敬的评委,女士们,先生们! I think you would be very glad to see me ,because I'm the last candidate of this morning . 我想你们会很高兴见到我,因为我是今天早上最后一名选手. After
