以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 proparediol acetal was synthesized by using stannous chloride as catalyst.以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 propanediol acetal was synthesized by using st...
As we fall asleep the amplitude of brain waves slowly becomes greater.进入睡眠状态时，我们的脑电波振幅慢慢变大。By their comprehensiveness and amplitude these picture fille the imagination.这些照片以其综合性和丰富而充满了想像力.The foreground for the cooperati...
Joe was very busy in the garret.裘正在顶楼上忙得不亦乐乎.live in a garret住在阁楼上No doubt he lived in a garret.毫无疑问,他住在一间小阁楼上.I would rather be a poor man in a garret with plenty of good books to read than a king who did not love readi...
Each home boasts an unprecedented level of quality throughout.每家的质量都堪称一流。China's industry is developing at an unprecedented rate.中国工业正以空前的速度发展.This achievement is surely unprecedented.这成就确实是空前的....
The shooting occurred in the 34th Precinct.枪击事件发生在第34警区。The driver said impassively, " You better check with your precinct.司机不动声色他说: “ 你最好还是到你们管区警察局里去查一查再说吧.The tradespeople in his precinct appreciated it. And they showe...
有些人喜欢烹饪前把火鸡的腿和翅膀扎紧。Some people like to truss up the turkey.这些小火鸡的装运日程已经脱节了好几个小时.Already " the poults'schedule was out of joint by several hours.我们要用手把这些东西塞到火鸡的肚子里去?We're supposed to put the stuffing inside the ...
He attacked the North American Free Trade Agreement ( Nafta ) and said It'should be renegotiated.他大力抨击《北美自由贸易协定》 ( Nafta ),认为必须就该协定重开谈判.The NAFTA debate also exposed the often unnoticed fact that the environmental c...