构成实体键的属性是在设计时选择的。
The properties that make up an entity key are chosen at design time.
FPGA技术在许多领域均有广泛的应用，特别是在无线通信领域里，越来越多的工程师在进行数字集成电路的设计时选择fpga。
FPGA can be widely used in many fields, especially Wireless communication field, more and more many engineer chooses FPGA when carrying out the design of digital integrated circuit.
进行选择，只对那些带有某种计时功能的方法进行分析。
Performing selection for profiling only those methods with certain timing characteristics.
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