A可以调用和访问b的元素，但B不可以访问A的元素。
通过使用ACL，可以更好地控制谁可以、谁不可以访问或执行文件或目录；这由按用户或组分配给文件的扩展权限决定。
Using ACL gives more control on who can and cannot access or execute a file or directory; that is determined by the extended permissions that can be given to a file on a user or group basis.
单一控制——交互可能全部都在提供其控制的业务领域内，不可以从该领域外部访问。
Sole governance — an interaction may lie wholly within the area of the business that provides its governance and not be accessible from outside of it.
此外，DB 2中的原生xML支持提供对文档特定部分(xml节点)的高效访问；大对象不可以。
Furthermore, native XML support in DB2 provides efficient access to specific portions (XML nodes) of a document; large objects do not.
一条消息的XML和FIX元素值也可以被访问，但是不可以修改。
The XML and FIX element values of a message can also be accessed, but not altered.
不可以在稀疏查找中使用批量访问方法。
在集群中脱机的磁盘资源，在任何集群节点中都不可以通过操作系统访问。
Anytime a disk resource is offline in a cluster, the volume that the resource points to (the disk with the matching signature) will be inaccessible to the operating system on any of the cluster nodes.
为什么这不可以友元函数访问私有变量？
Why can't this friend function access the private variables?
派生类能够恢复继承的成员的访问级别，但是改变基类定义的访问级别，增加或者减少都是不可以的。
The derived class can restore the access level of an inherited member. The access level cannot be made more or less restrictive than the level originally specified within the base class.
一个成员声明为static，那么他是不可以被这个类的实例来访问的(虽然静态方法可以)。
A member declared as static can not be accessed with an instantiated class object (though a static method can).
一个成员声明为static，那么他是不可以被这个类的实例来访问的(虽然静态方法可以)。
A member declared as static can not be accessed with an instantiated class object (though a static method can).
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