The phrase "are highly constrained" is correct and usable in written English.
It can be used to describe situations, conditions, or entities that are significantly limited or restricted in some way.
Example: "The resources available for this project are highly constrained, which will affect our timeline and deliverables."
Alternatives: "are severely limited" or "are significantly restricted."
"U.S. exports of unmanned systems are highly constrained.
What I have set out is a Keynesian approach to a demand crisis, but operating in a new world in which governments are highly constrained by these very febrile international financial markets.
However, these reformulations are highly constrained and can be expensive to solve.
It has been also observed that the obtained solutions are highly constrained.
Hence, Moulton and Thomas (1993) conclude that turnaround activities are highly constrained by forces external to the organization.
Moreover they are highly constrained due to the Shannon theory especially in the case of low activity sporadic signals like electrocardiogram, phonocardiogram, seismic, and so forth.
Any potential leftwing government will be highly constrained; its budget could be vetoed by the (Fidesz-staffed) budgetary council, upon which the (Fidesz-appointed) president can dissolve parliament.
Ming-Chi Kuo, an analyst for KGI Securities, another research firm, also said that he expected supply of the iPad Mini to be highly constrained when it is released.
He argues that reading is highly constrained by fixed, innate brain structures with only a little flexibility, just enough to allow this unprecedented skill to emerge at all.
"Evolutionary change in any particular lineage is highly constrained by the lineage's phylogenetic history," Dr. Chapais said, referring to the evolutionary family tree.
The obvious lesson from this episode is that even when the president invests significant "political capital" in a legislative initiative, his abilities to get said laws enacted is highly constrained.
