026 Natural substances 自然物质 (zìrán wùzhì)

footprint
clear, distinct

54 脚印 [-] jiǎoyìn (foot-print) footprint: 一行/串~ a trail of footprints || 大~ large footprints '
69 清晰 [-] qīngxī (clear-legible) clear, distinct: ~的脚印 clear footprints || ~的思路 clear mind || ~的声音 distinct sound '

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