In book,Use case diagram is static or dynamic view? (for UML)

I study UML by myself in the book
The Unified Modeling Language User Guide
written by Grady Booch, James Rumbaugh and Ivar Jacobson.

From study this book,
I understand that use case diagram is for static view, but
suddenly is for dynamic.

Since the book say
"the static aspects of this (use case)view are captureed in use case
diagrams."
^^^^^^^
and also say
"use case diagram is one of the additional diagram
to view the dynamic parts of a system use case diagram"
^^^^^^^^^^

I really can't understand why use case diagram is static diagram, but
sometime be dynamic. I don't know how to understand it correctly.
Thank you very much.




PS:The full context about my problem is describing as the following...
==========================================

In page 32, it say that
The use case view of a system encompasses the use cases that describe
the
behavior of the system as seen by its end users, analysts,and testers.
This view
doesn't really specify the organization of software system. Rather it
exists to
specify the forces that shape the system's architecture. With the UML,
the
static aspects of this view are captured in use case diagrams; the
dynamic
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
aspects of this view are captured in interaction diagrams, statechart
diagrams,
and activity diagram.

In page 94, it say that
You'll often use five additional diagrams to view the dynamic parts of
a
system.
^^^^^^^^^^^^^^^^^^^^^^^^^^

1. Use case diagram
^^^^^^^^^^^^^^^^^^^^^
2. Sequence diagram
3. Collaboration diagram
4. Statechart diagram
5. Activity diagram

.

Relevant Pages

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