1·Practise mental arithmetic when you go out shopping.
外出购物时练习一下心算。
—— 《柯林斯英汉双解大词典》
2·I think there should be equal concern for those who are unable to cope with simple mental arithmetic—particularly girls.
我认为对于那些不能应付简单的心算的人,尤其是女孩,应该给予同样的关注。
3·At school I did three years of arithmetic in one. I was particularly good at mental arithmetic.
在学校我把三年的数学课程一年就学完了,我特别擅长心算。
4·But it can also improve the brain's ability to do mental arithmetic.
它还能改善大脑做心算的能力。
5·I was particularly good at mental arithmetic.
我特别擅长心算。