The TV set should have built in power back up system.The TV set should have built in power back up system.

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TheTVsetshouldhavebuiltinpowerbackupsystem.TheTVsetshouldhavebuiltinpowerbackupsystem.TheTVsetshould

The TV set should have built in power back up system.The TV set should have built in power back up system.
The TV set should have built in power back up system.
The TV set should have built in power back up system.

The TV set should have built in power back up system.The TV set should have built in power back up system.
Power back up system 是备用电源系统;should have buit 是虚拟语气,“应该有”,
整句意思可能是“电视系统应该配备备用电源”.结合上下文,看是否正确?