By dust, he means something that was obviously (and ploddingly) designed by an adult.
ב"אבק", הוא מתכוון למשהו שבאופן ברור (ובלתי מלהיב) תוכנן על-ידי מבוגר.
She was happy, surely ploddingly, but dedicated and placid.
היא התנהלה מעט באיטיות, אך מלאת רצון ושלווה.
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