letter combination

• 字母组合

letter combination的用法和样例：

例句

1. I learned about serif and san serif typefaces, about varying the amount of space between different letter combinations, about what makes great typography great.
   我学习写带短截线和不带短截线的印刷字体，根据不同字母组合调整其间距，以及怎样把版式调整得好上加好。