mental arithmetic的词源

英文词源

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delicate

delicate: [14] Delicate comes either from Old French delicat or direct from its source, Latin dēlicātus, but its ultimate history is obscure. Its formal similarity to delicious and delight, and the fact that ‘addicted to pleasure’ was one of the meanings of Latin dēlicātus, suggest that the three words may have an ancestor in common. Delicatessen [19] was borrowed from German delikatessen, plural of delikatesse ‘delicacy’, which in turn was acquired by German from French délicatesse.
=> delicatessen

中文词源

mental arithmetic：心算

mental,心理的，arithmetic,算术。即心算。

该词的英语词源请访问趣词词源英文版：mental arithmetic 词源，mental arithmetic 含义。