It is mandatory to maintain the balance
Structural frame evaluating an action via the adjective 'mandatory'.
In this competition, it is mandatory to maintain the weight balance between categories.
—Why do they check the weight? —It is mandatory to maintain the balance according to the rules.
The referee confirmed that it is mandatory to maintain the balance in every round.
In this competition, it is mandatory to maintain the weight balance between categories.
—Why do they check the weight? —It is mandatory to maintain the balance according to the rules.
The referee confirmed that it is mandatory to maintain the balance in every round.