音标:[ˈmentl əˈriθmətik] ;
n. 心算

mental arithmetic的用法和样例:

例句

用作名词(n.)
  1. He is good at mental arithmetic.他擅长心算。
  2. I get a mental block every time I try to do sums in my head.每次我用心算做加法时,我的脑子就木了。

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