Next, specify a null because you're not adding a PDF link (created with the AddLink method) target for this image.
下一步，指定一个空值，因为您没有为此图像添加pd f链接(通过AddLink方法创建)目标。
However in this case, the link's ref attribute will be set to the value "null," and the link's text content will be hidden unless a flag to show null-link content is set to true.
但是，在这种情况下，这个链接的ref属性会设置为“null”值，而且链接的文本内容会隐藏起来，除非将显示空链接内容的标志设置为true。
In the quiescent state, the next field of the link node pointed to by the tail is always null; in the intermediate state, it is always non-null.
在静止状态时，尾指针指向的链接节点的next字段总为null，而在中间状态时，这个字段为非null。
In the quiescent state, the next field of the link node pointed to by the tail is always null; in the intermediate state, it is always non-null.
在静止状态时，尾指针指向的链接节点的next字段总为null，而在中间状态时，这个字段为非null。
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