美国 Rosetta Stone English(罗赛塔石碑语言学习软件)是风靡世界的多媒体英语教学软件。Rosetta Stone Language Library已被美国国务院认可,用来培训外交官。美国航天局及一些重要机构也用它 来培训自己的员工。实践证明,Rosetta Stone English是一套行之有效的英语学习方法。 Rosette Stone English采用当今外语界 ...
Hydrogen is one of the most pervasive elements in the crust and upper mantle of our planet. It is a mobile, reactive component which can cause major changes in the chemical, physical, rheological, and electronic properties of the host phase. Much of the effort of our group is directed at investigat ...