the sand reckoner中文什么意思

沙计算手册

• sand:    n. 1.沙。 2.〔 pl. 〕 ...
• reckoner:    n. 计算者；计算便览(＝ready ...
• ready reckoner:    简便计算表

例句与用法

1. The sand reckoner
   沙计算手册

百科释义

The Sand Reckoner () is a work by Archimedes in which he set out to determine an upper bound for the number of grains of sand that fit into the universe. In order to do this, he had to estimate the size of the universe according to the contemporary model, and invent a way to talk about extremely large numbers.