n. 
同(性),

调(性)
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double check,
double chin,
double cream,
double cross,
double crosser,
double date,
double decomposition,
double division,
double dribble,
double dutch,
相似单词
cooperation,
co-operation,
cooperationist,
cooperative,
cooperatively,
cooperativity,
cooperativize,
cooperator,
Cooperite,
coopery,