1 N-SING (学科等的)基础知识,入门 The
ABC of a subject or activity is the parts of it that you have to learn first because they are the most important and basic.
(学科等的)基础知识,入门 SYN basics, principles, elements, essentials
2 N-COUNT 字母表(儿童识字、写字、拼词用的全部字母) Children who have learned their
ABC or their
ABCs have learned to recognize, write, or say the alphabet.
字母表(儿童识字、写字、拼词用的全部字母) [informal] View usage for:All yearsLast 10 yearsLast 50 yearsLast 100 yearsLast 300 years