A multiple-tray, multiple-compartment food package that allows for individual trays to be initially packaged together in a connected manner, yet later be separated from each other while a film remains intact upon the trays to allow opening at different times. The notification appliance responds to the message by activating one or more of its notification devices. Displacing a portion of the YZ movement rope allows vertical displacement of the platform to be traversed. Therefore, the operation efficiency can be improved and the cost of constructing a wind power plant on the offshore can be reduced.