The main constraint to that is usually politics.
The main constraint on the race is not aversion to competition but the scarcity of funds.
The main constraint on the Cuban economy is its productive capacity, not the size of its global market.
The main constraint on this evolution is that no two species in a community can have the same niche.
The main constraint to putting the kitchen sink -- say, allowing school vouchers or outlawing abortion -- into a reconciliation bill is the Byrd Rule, named after the Senate's chief parliamentary scold, Robert C. Byrd, Democrat of West Virginia.
The main constraint on this reactor design is its transportability.
The main constraint for clinical imaging is to reduce the acquisition duration.
The main constraint of our experiment is simplifications in the model.
The main constraint driving the algorithm design was to reduce the computational and memory costs.
The main constraint of wireless sensor networks (WSNs) is the limited and generally irreplaceable power source of the sensor nodes.
The main constraint in this optimizing problem is the equality between demand and supply in the market clearing.
