The device had been used operationally some months previously.
该设备几个月之前曾投入运行。
Unfortunately, this technique is operationally expensive and does not scale.
不幸的是，这项技术操作费事且不可划分。
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。
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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