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covalent,
covalent bond,
covar,
covariability,
covariance,
covariant,
covariation,
covary,
cove,
covelline,
相似单词
battle ship,
battleax,
battle-ax,
battleaxe,
battle-axe,
battlebus,
battled,
battledore,
battledore and shuttlecock,
battledress,