用例将描述主要成功方案（购买者根据这些方案购买股票）和一些可能出现错误的扩展。
The use case describes the main success scenario, according to which the purchaser buys the stock, and several extensions for what could go wrong.
这些方案将根据具体国家的需求来设计，以帮助减少高涨的和动荡的石油价格(直接或间接)引起的家庭收入的下降。
The programs will be tailored to the needs of individual countries to help reduce the fall in household income caused-directly and indirectly-by high and volatile oil prices.
如果您未指定join列，JPA将根据命名方案尝试解析这些键。
If you do not specify the Join column, JPA will attempt to resolve the keys based on a naming scheme.
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