They all need knowledge of the alphabeticcode and the skills of blending sounds for reading and segmenting the spoken word for spelling whether they learn to read easily or find it difficult.
Code fields may use an abstract set of alphabetic values.
代码字段可能使用字母值的一个抽象集。
3
Well, when dealing with user input from forms, for example, you typically check each form submitted to make sure that it's what you expect (numbers, ZIP code, alphabetic characters, and so on).