底层HSK 7-9dǐcéngfirst floor, understratum, bottom, underside, the lowest rung, first, undersurface, underlayer, ground level, ground floor, first/ground floor, substratum, first_floor, basement Connected through: 层
底线HSK 7-9dǐxiànto underline, bottom line, base line (in sports), baseline, minimum, spy, plant Connected through: 线
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