An operation of cascades of centrifuges may indicate that something-is-the-case.
Testing of cascades may indicate that something-is-the-case.
(Member governments) can be concerned about a cascade of dams.
A cascade can be constituted-of-or-filled-with controversies.
An islamic republic may declare an installation of some cascades of some centrifuges.
Some cascades can be constituted-of-or-filled-with centrifuges.
A (cascade line) can be constituted-of-or-filled-with some centrifuges.