心算 (xīn suàn) — 暗算

定義

例文

• 她的心算能力非常强，几秒钟就能算出答案。
  Tā de xīn suàn néng lì fēi cháng qiáng, jǐ miǎo zhōng jiù néng suàn chū dá àn.
  Her mental arithmetic ability is very strong — she can calculate the answer in a few seconds.
• 小学时我们经常做心算练习。
  Xiǎo xué shí wǒ men jīng cháng zuò xīn suàn liàn xí.
  In elementary school, we often did mental arithmetic exercises.
• 做心算比用计算器更能锻炼大脑。
  Zuò xīn suàn bǐ yòng jì suàn qì gèng néng duàn liàn dà nǎo.
  Doing mental arithmetic is better for exercising the brain than using a calculator.