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。
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