Why can't the math vector of Grade One be greater than the size? !

Vector has geometric meaning, and it represents a directed line segment. Therefore, it is impossible to compare the sizes between vectors. Because a vector has two symbols: length (here refers to a directed line segment) and direction, there is no difference between size and direction. The size of the vector mainly compares the modulus of the vector. Modulus is a specific number, indicating the length of this directed line segment, and the length can be compared.