For example, investors are ready to buy gold after handling precious metals business in CCB, but recently the market is not good, the price of gold has fallen, and banks have sold gold. However, investors think that the gold price at this time is suitable for buying, so they buy gold when the bank sells gold. This process is called short opening.

Short position of CCB means that investors buy precious metals in CCB account, bear short position of precious metals, and establish short position of precious metals in the account by "selling price". "Selling price" refers to the price at which banks sell precious metals and investors buy precious metals.

Short selling means that investors are not optimistic about the stock market prospect, expect the stock price to fall, sell the stock at a relatively high price, and then buy it when the stock falls to a certain price to obtain the difference income. Empty means the same as falling.

Open positions, also known as open positions. For the stock market, opening a position refers to the behavior of investors buying new shares. In the futures market, opening a position refers to investors buying or selling a certain number of futures contracts.

Closing position refers to the behavior of investors to buy or sell futures contracts with the same variety, quantity and delivery month, but in the opposite direction, and close the futures trading. "Buy and sell, sell and buy."