an a___________ is an old calculating machine补充单词(开头字母已给出)
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an a___________ is an old calculating machine补充单词(开头字母已给出)
an a___________ is an old calculating machine补充单词(开头字母已给出)
an a___________ is an old calculating machine补充单词(开头字母已给出)
abacus算盘
abacus