宾州煤的蕴藏量为三百五十亿吨.Pennsylvania sits on 35 billion tons of coal.一茶匙中子星上的物质重达十亿吨.One teaspoonful of material from a neutron star would weigh a billion tonnes....
Ayer started N. W. Ayer & Son in 1869, naming the firm for his father.艾尔在1869 年成立了 N. W. 艾尔父子公司，公司以他父亲的名字命名。The cross reference for the specified naming context could not be found.找不到指定的命名上下文的互交参考.Their sequence in namin...