First of all, the "diffuse" in the wind and sand all over the sky can refer to thick dust, which means it is full and occupies almost all the space. This natural scene makes people feel dry, powerless and at a loss. So "diffuse" can indicate a state of being at a loss and at a loss.
Secondly, "rambling" can also mean falling into a state unconsciously, such as "roaming the world" and "walking in the park". This state is often the relaxation of body movements, but the mind is thinking and feeling everywhere. In this state, people can feel the freedom and release of thinking, and occasionally have some whimsy.
"Wandering" can also refer to busy, confused and unrestrained consumption of one's time, such as "shopping aimlessly" and "endless work", which makes people feel tired and helpless.
In short, the "sandstorm" in the sky is not just a simple expression of a word, but a reflection of one's mental state and environment.