字母的的用法和樣例：
例句
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希臘字母的第六個(gè)字母
The sixth letter of the Greek alphabet. -
代數學(xué)計算的普遍原理，其中通常為字母表中字母的符號，其代表數字或一組特定數字中的幾個(gè)數字，它們通過(guò)對組中全部數字都適合的運算法則相聯(lián)系
A generalization of arithmetic in which symbols, usually letters of the alphabet, represent numbers or members of a specified set of numbers and are related by operations that hold for all numbers in the set.
