1, "He": Conjunction is also a coordinate relationship, but it is often divided into primary and secondary. The main components and the words in the first order should be placed before "and", such as "steel, coal, petroleum, electric power and other industries" (Grade I and II) and "infants and teenagers" (Grade I and II).
2. "He": Conjunction is a coordinate relationship, which can be in no particular order.
Second, the parts of speech are different.
1, "and": usually used with nouns, such as "primary school, middle school, university".
2. "Harmony": the connection can be a noun, such as "workers and peasants"; It can also be a verb, such as "spread and accept"; It can be an adjective, such as "smart and beautiful"; It can also be a pronoun, such as "he and me".
Third, the usage is different.
1, "and": to some extent, it is biased towards the former, and the expression effect is slightly better than sum, while sum is a more accurate balance between the two.
2. "He": as a conjunction, it can indicate choice, which is equivalent to "or"; "He" has no such meaning.