用金属锂 - 液氨一步还原法合成γ姜黄烯.实验证实γ姜黄烯极不稳定,室温下极易芳香化转变成α姜黄烯.The synthesis of ν - curcumene was described. The experiment affirmed that ν - curcumene can aromatize to α - curcumene readily at room temperature....
Ellen's face wrinkles as if she is about to sneeze.艾伦的脸皱了起来，好像要打喷嚏。Some deep wrinkles furrow his lower forehead.他额头下方出现了几道深深的皱纹。His face was covered with wrinkles.他的脸上布满了皱纹。...
An official decree invalidated the vote in the capital.一份官方法令宣布在首都举行的投票无效。A contract signed now might be invalidated at some future date.现在签订的合同可能在将来的某一天就会失效。The court rejected EPA's position and invalidated all the...