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go to sea, by sea, by the sea<-->in office, in the office
the doctor and teacher, the doctor and the teacher
the doctor and teacher指一个人，既是医生又是老师，在句中充当主语时，谓语用单数。
the doctor and the teacher两个人，一个医生和一个老师，在句中充当主语时，谓语用复数。
go to sea, by sea, by the sea<-->in office, in the office
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