eratosthenes,

eratosthenes mathematician, geographer, astronomer 276 bc- 194
eratosthenes' method for determining the earth's circumference.
eratosthenes and the mystery of the stades(埃拉托色尼和施塔德的
厄拉多塞(eratosthenes,前275～前195)生于利比亚.
示例二: "eratosthenes筛法"