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)
x)KSHGbP~NBrbNriNbIf^BnbrFf^ꋅK>b}=O4<]>ݾOwiTO lh?=F 1j G/ݞ

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