New words：

calculation [ˌkælkjəˈleɪʃ(ə)n] n. 计算；预测；估计；算计

calculator [ˈkælkjəˌleɪtər] n. 计算器

Sample Sentences：

He made a mistake in his calculation.
Her calculation of the total was correct.
I can't work it out in my head ─ I need a calculator.

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