letters of the alphabet written in their large form, for example ‘A' rather than ‘a'. Block capitals are often simply calledcapitals. 大写字母(通常简称为capitals)
a letter of the alphabet used as a symbol for a consonant. All the letters of the English alphabet are consonants except for ‘a', ‘e', ‘i', ‘o', and ‘u', which are vowels. 辅音字母
one of the letters ‘a', ‘e', ‘i', ‘o', or ‘u', used for representing these sounds. In English, ‘y' is sometimes considered to be a vowel. The other letters are calledconsonants. 元音字母(指用于代表元音发音的字母a, e, i, o, u;英语中的y有时也被认为是元音字母)