Site: 1. You can buy other people's shares, so you buy them at the transaction price, and there is a premium or discount between the transaction price and the net value.

2. You can purchase, purchase according to the net value, don't buy or sell, and get a new share, which is different from buying.

Off-site: You can only buy it, but you can't enter the on-site transaction and sell it. You can only redeem it off-site.