The ControlSoftware on the left side of the diagram (control1) controls engines 1 and 2.
在图左边上的ControlS of tware (control1)控制引擎1和2。
In Figure 20 the Plane has two ControlSoftware objects and each one controls two engines.
在图20中Plane有两个ControlS of tware对象，而且每个控制二个引擎。
The ControlSoftware on the right side of the diagram (control2) controls engines 3 and 4.
在图右边的ControlS of tware (control2)控制引擎3和4。
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