The device had been used operationally some months previously.

该设备几个月之前曾投入运行。

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At the same time, hotels must also be profitable and operationally efficient.

与此同时，酒店也必须带来盈利与营运效益。

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At the same time, hotels must also be profitable and operationally efficient.

与此同时，酒店也必须带来盈利与营运效益。

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