日本回收电子垃圾做奥运奖牌 被指卑鄙

How much metal is needed?

需要多少金属？

The amount of metal needed will depend on the size and number of medals, since each year, they seem to get bigger and heavier.

所需的金属数量取决于奖牌的大小和数量。每一年奖牌都在变得越来越大，越来越重。

Five new sports have also been added to the Tokyo 2020 competition, including baseball, karate, skateboarding, sport climbing and surfing.

2020年奥运会新加了五项运动，分别是棒球、空手道、滑板、运动攀岩和冲浪。

The 2016 Rio Olympics had the largest medals of any games, weighing in at 500g each and 1cm thick in the middle.

2016里约奥运会的奖牌大小是有史以来最大的，重500克，中间厚1厘米。

The Brazilian Mint produced 5,130 medals in total, up from the 4,700 made by London's Royal Mint for the 2012 Games.

巴西铸币局总共制造了5130枚奖牌，超过了伦敦皇家铸币局为2012年奥运会制造的4700枚奖牌。

How much will it cost?

花费多少？

It may end up being cheaper using recycled metals than buying it on the spot market.

使用回收的奖牌会比在现货市场上买便宜。

A little-known fact is that the gold medals are mostly made out of sterling silver and the bronze metals are mostly made out of copper.

一个鲜有人知的事实是金牌大多是由标准纯银制成，铜牌则大多由青铜制成。

Isn't that rather sneaky?

这是不是有点“卑鄙”？

The IOC minimum requirement for a gold medal is 6g of the pure yellow metal.

国际奥委会对金牌的要求是至少要有6克的金。

If the medals were made of pure gold, the overall cost would run into tens of millions of dollars.

如果奖牌是纯金的，那么总花费将达到几千万美元。

Gold is currently about 70 times more expensive than silver. But some market experts think that may change by 2020.

现在金的价格比银贵70倍。但是一些市场专家认为到2020年形势会有所变化。

Global silver reserves continue to shrink as demand is exceeding supply and we mine only 11oz of silver for each ounce of gold, said Gregor Gregersen, the founder of Silver Bullion in Singapore.

全球银储存量在逐渐减少，供不应求。新加坡Silver Bullion的创立者格雷格尔·格雷格森说，我们每挖出一盎司的金，只能挖出十一盎司的银。