Calculating by heart
Chinese idiom, Pinyin is j ì y á nx à NSU à n, which means careful research and calculation. From the epitaph of Zhang Fujun.
The origin of Idioms
In the epitaph of Zhang Fu Jun written by Fan Jun of Song Dynasty, it is said that "after the great cause of Ding, the production is getting worse and worse, and the Fu Jun has to study and calculate in order to manage the production
Idiom usage
Used as a predicate or object; used in writing.
Chinese PinYin : jì yán xīn suàn
Calculating by heart
There is no one who grabs gold. jué jīn bù jiàn rén
cover one 's face and creep away. fèng tóu shǔ cuàn
the declining age is like a candle in the wind. fēng zhú zhī nián
Small as the sparrow is, it has all the internal organs. má què suī xiǎo,wǔ zàng jù quán