وَطِرَاقًا مِنْ خَلْفِهِنَّ طِرَاقٌ ۞ سَاقِطَاتٌ أَلْوَتْ بِهَا الصَّحْرَاءُ
Translation: Behind them successive layers or traces of motion appear, while the desert ground wears or sweeps them away.
Ṭirāq may be read in the explanatory context of layered hoof-traces or repeated impressions; alwat carries a sense of wearing away or undoing. Al-ṣaḥrāʾ is the dominating setting.
The diction is unusual and calls for a qualified interpretation. The secure core of the image is rapid travel, successive tracks, and the desert’s effect on those traces.