He was introducing Hindu-Arabic numerals to his kids.
他正在向他的孩子们介绍印度阿拉伯数字。
Although the Babylonians had symbols for a zero placeholder in their Numbers, as did the Mayans. It was the Hindu-Arabic system that first worked with the concept of zero things.
虽然巴比伦人跟玛雅人一样，其数字中有符号表示零占位符，但正是印度-阿拉伯语数字系统首次应用零的概念进行运算。
We really start to see the power of the Arabic-Hindu system coming into its own as we hit the big Numbers.
当我们撞见大数字时，我们才真正开始见证到阿拉伯-印度数字系统自身的威力。
Until about 1450 spherical trigonometry consisted of loose rules based on Greek, Hindu and Arabic versions.
差不多直到1450年球面三角的内容由一些不严谨的法则组成，这此法则的基础是希腊、印度和阿拉伯译本。
Until about 1450 spherical trigonometry consisted of loose rules based on Greek, Hindu and Arabic versions.
差不多直到1450年球面三角的内容由一些不严谨的法则组成，这此法则的基础是希腊、印度和阿拉伯译本。
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