Perhaps one of the most important additions in MathML3 is a new set of functionality for laying out elementary math. These are the tabular layouts used for longmultiplication and long division.
也许MathML3中最重要的增加是一组用于布局基本数学公式的新功能，即用于长乘和长除的表格布局。
2
All this was compatible with older devices so long as there was only one authoritative timekeeper; but with urban growth and the multiplication of time signals, discrepancy brought discord and strife.