In Yu Guangzhong's Homesickness, what are the meanings of these four locative words: this head, that head, outside and inside?

this head; Refers to the location of the poet, that end; It is opposite to the place where the poet stands, outside; Refers to the outside and inside of the poet's place; It refers to the inside of the poet's place. (this end: for example, the place where the poet stands is the bridge, so the place where he stands is this end, and that end refers to the opposite side of the bridge. Outside: for example, a poet stands in the middle of an alley. Outside refers to the entrance of the alley, while inside refers to the depth of the alley. ) That's probably what it means. . . .