可惜对于地理的知识还很欠缺.In geography there is still much to be desired.必须先和大家讲清楚,我根本不是教地理的教师.I must make it clear that I am in no sense a geography teacher.这些想象的地理与地理的想象空间是本研究的重要内容.These geographic imagination and imaginary geogra...
The material is readily prepared by reaction of formaldehyde and hydrazine.这种物质很容易由甲醛和肼反应而得到.Formaldehyde slowly inactivates many viruses.甲醛能慢慢使多种病毒失去活性.Sulfur dioxide and formaldehyde both produce irritation.二氧化硫和甲醛都可产生...