单词：abacus
[计] 算盘
n. a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves
abacus的用法和样例：
例句
- The abacus is the ancestor of the modern computer.算盘是现代电脑的原型。
- Can you use an abacus, Mr. Cooper?库珀先生，请问你会用算盘吗？
词汇搭配
- logical abacus逻辑算盘
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