What is the white apple in the poem?

This is a white apple with a foggy surface. The white apple is a line in Ye Saining's Please Come with me. The whole poem reads: "Don't be sad, don't torture yourself, everything will pass, just like the smoke coming from the white apple tree". A white apple tree refers to a white apple with fog on its surface. Sergei Aleksandrovich Ye Saining (1895 65438+1October 3-1925 65438+February 28), a Soviet poet, whose main works are Birch Tree, The Voice of Moscow Tavern and Anna Sneijder.