abacus的发明英语作文
abacus的发明英语作文
不用太多
不用太多
英语人气:316 ℃时间:2019-12-09 19:16:45
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An abacus,also called a counting frame,is a calculating tool used primarily in parts of Asia for performing arithmetic processes.Today,abaci are often constructed as a bamboo frame with beads sliding ...
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