n. 
堑,裂谷
近
词
n.
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differencing,
different,
different from,
differentia,
differentiability,
differentiable,
differentiableatlas,
differentiableembedding,
differentiabletransformation,
differentiae,
相似单词
riflescope,
rifleshot,
rifling,
rifomycin,
rift,
rift valley,
Rift Valley fever,
rifter,
rifting,
riftless,