掷铁饼

zhì tiě bǐng shì tóu zhì xiàng mù zhōng yī xiàng gǔ lǎo de bǐ sài xiàng mù

掷铁饼是投掷项目中一项古老的比赛项目。

Discus throw is an ancient game among the throwing events.

rú hé què dìng zhì tiě bǐng chǎng dì de zhōng xiàn de fāng xiàng

如何确定掷铁饼场地的中线的方向？

How to decide the direction of central line of the discus ground?