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1. （连接两个或两个以上选择的可能性）或，或者，还是
You use or to link two or more alternatives.

2. （与 either 或 whether 连用，给出另一个选择项）或，还是，就是
You use or to give another alternative, when the first alternative is introduced by 'either' or 'whether'.

1. a room in a hospital equipped for the performance of surgical operations

e.g. great care is taken to keep the operating rooms aseptic

Synonym: operating roomoperating theateroperating theatresurgery

2. a state in northwestern United States on the Pacific

Synonym: OregonBeaver State