快步行走常常会使人感到身心舒畅。Taking a brisk walk can often induce a feeling of well-being.人们的心情十分舒畅。People were in a pretty good mood.他心情舒畅,对前途很有信心.His mind was at ease and he felt confident in the future....
This article introduced a method for preparing α - chloro - isobutylaldehyde , in order to explore a practical chloration of oxo - compound.本文介绍了制备氯代异丁醛的方法, 其目的在于探索羰基化合物的一种实用的氯代方法....