When the user needs some data presented in a specific format, taking the raw data and processing it on spot may delay the response to the point that the user gives up waiting on it.
当用户需要以特定格式来展现数据时，获取原始数据随即进行处理会延长响应时间，以至于用户放弃等待结果。
2
It is rare for investors to take physical delivery of commodities, so no raw materials are removed from the supply chain (another reason why investors are unlikely to affect spot prices).