手机APP下载

您现在的位置: ms196明仕亚洲 > 英语听力 > 双语有声读物 > 万物简史 > 正文

万物简史(MP3+中英字幕) 第147期:基本物质(15)

来源:可可英语 编辑:villa   VIP免费外教试听课 |  可可官方微信:ikekenet
 下载MP3到电脑  批量下载MP3和LRC到手机
加载中..
Because chemists for so long worked in isolation, conventions were slow to emerge. Until well into the second half of the century, the formula H2O2 might mean water to one chemist but hydrogen peroxide to another. C2H4 could signify ethylene or marsh gas. There was hardly a molecule that was uniformly represented everywhere.
由于化学家们长期在隔绝的环境里工作,形成统一用语的速度很慢。直到19世纪末叶,H2O对一个化学家来说意为水,对另一个化学家来说意为过氧化氢。C2H4可以指乙烯,也可以指沼气。几乎没有哪种分子符号在各地是统一的。
化学Scientists also used a bewildering variety of symbols and abbreviations, often self-invented. Sweden's J.J.Berzelius brought a much-needed measure of order to matters by decreeing that the elements be abbreviated on the basis of their Greek or Latin names, which is why the abbreviation for iron is Fe (from the Latin ferrum) and that for silver is Ag (from the Latin argentum ). That so many of the other abbreviations accord with their English names (N for nitrogen, O for Oxygen, H for hydrogen, and so on) reflects English's Latinate nature, not its exalted status. To indicate the number of atoms in a molecule, Berzelius employed a superscript notation, as in H2O. Later, for no special reason, the fashion became to render the number as subscript: H2O.
化学家们还使用各种令人困惑的符号和缩写,常常是自己发明的。瑞典的J.J.伯采留斯发明了一种非常急需的排列方法,规定元素应当依照其希腊文或拉丁文名字加以缩写。这就是为什么铁的缩写是Fe(源自拉丁文ferrum),银的缩写是Ag(源自拉丁文argentum)。许多别的缩写与英文名字一致(氮是N,氧是O,氢是H等等),这反映了英语的拉丁语支性质,并不是因为它的地位高。为了表示分子里的原子数量,伯采留斯使用了一种上标方法,如H2O。后来,也没有特别的理由,大家流行把数字改为下标,如H2O。
重点单词   查看全部解释    
formula ['fɔ:mjulə]
想一想再看
n. 公式,配方,规则;代乳品
adj. (赛
联想记忆
measure ['meʒə]
想一想再看
n. 措施,办法,量度,尺寸
v. 测量,量
联想记忆
symbols ['simbəls]
想一想再看
n. 符号;象征;标志;符号表(symbol的复数)
 
hydrogen ['haidridʒən]
想一想再看
n. 氢
 
signify ['signifai]
想一想再看
vt. 表示,预示,意味着,象征
vi. 有重
联想记忆
emerge [i'mə:dʒ]
想一想再看
vi. 浮现,(由某种状态)脱出,(事实)显现出来
联想记忆
render ['rendə]
想一想再看
vt. 使成为,提供,报答,着色; 执行,实施
 
bewildering [bi'wildəriŋ]
想一想再看
adj. 使人困惑的;令人产生混乱的 v. 使迷惑(be
 
indicate ['indikeit]
想一想再看
v. 显示,象征,指示
v. 指明,表明
联想记忆
accord [ə'kɔ:d]
想一想再看
n. 一致,符合
v. 使一致,调解,给予
联想记忆
发布评论我来说2句

    英语学习专题

    可可英语官方微信(微信号:ikekenet)

    每天向大家推送短小精悍的英语学习资料.

    添加方式1.扫描上方可可官方微信二维码。
    添加方式2.搜索微信号ikekenet添加即可。