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In “a film of dark gray grime” (line 3), the word “film” means a light coating.
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In line 10, “Too much dust” implies that the dust is excessive.
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The text states that the lead is poisonous only for children.
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In “they have brushed off as a nuisance” (lines 13 and 14), the word “nuisance” means inconvenience, annoyance.
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The expression “brushed off”, in “they have brushed off as a nuisance” (lines 13 and 14), can be replaced, without changing its meaning, by cleaned.