They convert units of heat into useable engineering units that serve as input signals for process controllers and recorders.

他们将热量单位转换成可用的工程单位，作为过程控制器和记录器的输入信号。

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"Previously if aircraft wanted to climb or reroute, it was a tedious process and controllers often didn't have time, " said Dennis Addison, support manager for FAA's Oakland center.

WSJ: How New Air-Traffic Control Systems Operate Over Oceans