在这个市场上，一次交易成功的条件是出售价低于或等于买入价。
In this market a deal can be made only if the price of a sell order is lower than or equal to the price of a buy order.
函数的最后一行的行号从debug_line部分获得，其中，行号地址低于或等于函数的高位地址。
The last line number for the function is obtained from the debug_line section where the line number address is less than or equal to the high address of the function.
数据请求阀值策略：确保所有向应用程序发送的、低于或等于阀值水平的数据请求都可以被立即处理。
Data request threshold policy: Ensures data requests to the application can be processed immediately below or at the threshold level.
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