Sentence examples for usage is mandatory from inspiring English sources

Assessment of HIV-1 co-receptor usage is mandatory for the clinical use of this drug.

89 90 A sterile preparation of single doses is mandatory with timely usage to prevent contamination spreading and aggregates forming, which leads to enhanced intraocular inflammatory reactions.

(Unbelted motorists received no tickets that day - neither Busch Stadium seats nor violations - though seat-belt usage has been mandatory in Missouri since 1985). The Police Department promoted the ticket giveaway beforehand, revealing the day, but not the location.

Simulation speed-up is mandatory for simulating complete networks in a reasonable CPU usage time.

A helmet is mandatory.

Heft is mandatory.

Clearly, diligence is mandatory.

Attendance is mandatory.

Grading: Attendance is mandatory.

Registration is mandatory.

Class attendance is mandatory.