总而言之，这是一本通俗而务实的物理入门书。On balance, the book is a friendly, down-to-earth introduction to physics.我从图书馆借了一本语音学入门书.I borrowed from the library a primer of phonetics.我从图书馆借了一本科学的入门书.I borrowed a primer of science from the lib...
我们正在经历现代最严重的一段经济衰退。We are in one of the most severe recessions in modern times.前锋艾伦·史密斯两次严重失误，将球射偏。Striker Alan Smith was guilty of two glaring misses.全国的核武器工厂均受到了有毒废弃物的严重污染。Nuclear weapons plants across the country are ...