variable trace造句

The forewings are fawn brown mixed throughout with pale orange brown, with faint, narrow, variable traces of slightly darker post-median and subterminal faciae, and a few short darker strigulae along the costa.
The forewings are fawn brown mixed throughout with pale orange brown, with faint, narrow, variable traces of slightly darker post-median and subterminal facia and a few short darker markings along the costa.
The statement said Butler informed the Iraqi government during a meeting in Baghdad this month that " variable traces of VX " had been found in the analysis of seven samples of warhead parts.
The Iraqi statement also sought to find fault with the handling of the VX samples, saying Baghdad was told that only one of the seven samples analyzed had shown variable traces of VX . It also said that the samples were taken without giving Iraq equivalent samples, as had been agreed upon, and that no soil samples were taken for comparison.
It's difficult to find variable trace in a sentence. 用variable trace造句挺难的