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

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ana___________isanoldcalculatingmachine补充单词(开头字母已给出)ana___________isanoldcalculatingmachine补充单词(开头字母

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