The dot operator applies only to objects of class type: the left-hand operand must be an object of class type; the right-hand operand must name a member of that type.
点操作符仅应用于类类型的对象：左操作数必须是类类型的对象，右操作数必须指定该类型的成员。
A term that applies to a group of companies operating jointly, usually in a partnership with one company as operator in a given permit, license, contract area, block, etc.
指合作经营油气项目的一组公司，其中有一家公司为经营公司，拥有特定的许可证、合同区或合同区块等。
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