declivity

n (fml 文) downward slope 下斜. Cf 参看 acclivity.

decision, decision-making, decisive, decisively, decisiveness, deck, deck-chair, deck-hand, declaim, declamation, declamatory, declaration, declare, declared, declassification, declassify, declension, declination, decline, declining, declutch, decode, decoder, decoke, decolletage, decollete, decolonization, -isation, decolonize, decolonise, decompose, decomposition, decompress, decompression, decongestant, decontaminate, decontamination, decontrol, decor, decorate, decoration, decorative,