原理
，可作为科普读物 。相比起文学与文史题材的英语读本，科学英语更容易理解与学习
。因为讲述内容均为我们身边熟悉的事物 ，容易联想记忆，而且书中科技英语的语法、句子结构相对简单
，更简洁清晰。

评分不错，但缺点是内容比较陈旧 ，差不多是100年前的东西 。

（2）《牛津阅读和发现》（ Oxford Read and Discover）

暗银河系的发现及其科学意义

In addition to conventional galaxies, the universe contains very dim galaxies that until recently went unnoticed by astronomers. Possibly as numerous as conventional galaxies, these galaxies have the same general shape and even the same approximate number of stars as a common type of conventional galaxy, the spiral, but tend to be much larger. Because these galaxies ’mass is spread out over larger areas, they have far fewer stars per unit volume than do conventional galaxies. Apparently these low-surface-brightness galaxies, as they are called, take much longer than conventional galaxies to condense their primordial gas and convert it to stars—that is, they evolve much more