当用户进入表单的其他部分时，再获取底层数据。

As the user goes through other parts of the form, the underlying data can be fetched lazily.

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Rails应用程序的模型部分主要是它所使用的底层数据库。

The model part of a Rails application is primarily the underlying database it USES.

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系统以ARM微处理器和FIFO存储器为核心，利用可编程逻辑器件实现对整个底层数据采集系统的逻辑控制，并给出了时序控制部分的仿真波形。

The system controls the logic of the data acquisition board by programmable logic device (PLD) with the center of the ARM microcontroller and FIFO memory and provides the simulate waveforms.

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