锡连续主力合约日内跌4%

Group 1 - The core point of the article is that the continuous main contract for tin has experienced a significant decline of 4% in a single day, currently priced at 317,810 yuan [1] Group 2 - The article highlights the specific date of the price drop, which is December 16 [1] - The reported price of the tin contract is 317,810 yuan, indicating a notable market movement [1]