ca
[域] Canada ,加拿大;钙 Ca(calcium);certificate authority,证书权威
难易程度:
ca为短语/超纲词汇
ca
ca.
alsocaBrE
a written abbreviation of circa (=about)
dating from ca. 1900
alsocaBrE
a written abbreviation of circa (=about)
dating from ca. 1900
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