EntityContainer 中的每个成员名称都必须唯一。成员“<var>Member</var>”已在 EntityContainer“<var>X</var>”中定义。由于 EntityContainer“<var>Y</var>”扩展 EntityContainer“<var>X</var>”，因此 EntityContainer“<var>Y</var>”中不能存在同名的成员。

Each member name in an EntityContainer must be unique. The member '<var>Member</var>' is already defined in EntityContainer '<var>X</var>'. Because EntityContainer '<var>Y</var>' extends EntityContainer '<var>X</var>', you cannot have a member with the same name in EntityContainer '<var>Y</var>'.

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