How to understand these two sentences in this poem?

To understand this poem, we must first understand the author. Eva-Lisa. Manna was the most popular modernist poet in Finland in 1950s, and she was also a versatile playwright, essayist and translator. Living abroad for a long time. Her poems are reserved, but they also involve social and political issues.

The letter here can be regarded as the pursuit in the author's mind. Moonlight represents the ideal world, and the porch floor represents the real world in which he lives.

The author has lived abroad for a long time. "Everything sags and bends like iron, and there." That is to say, the author thinks that domestic life is full of negative energy.