The word billion denotes different numbers in American and British usage. In the American system, one billion equals109. In the British, French, and German systems, one billion equals 1012.See also Large Number, Milliard, Million, Trillion
数学辞典收录了8975条数学词条，基本涵盖了常用数学知识及数学英语单词词组的翻译及用法，是数学学习的有利工具。