与打印输出相关的数据库指示消息日志记录器元素已执行，并且System . out消息来自MDB。
The database related printouts indicate that the message logger primitive has executed and the System.out messages come from the MDB.
指示器，记录器监控发动机、熔炉、电网、水库或其它系统运作状况的仪器；指示板或。
An instrument used to monitor the operation or condition of an engine, a furnace, an electrical network, a reservoir, or another physical system; a meter or gauge.
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