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prolonged


continuing for a long time

Being in the sunlight for a prolonged period can lead to a bad sunburn.

prolonged

prototype


the first model of something, from which other versions are developed

Students have created a prototype of a scooter that can be powered by the sun.

prototype

ensure


to make sure that something happens

Before takeoff, the flight attendant walked through the aisle of the airplane to ensure that all passengers had fastened their seat belts.

ensure

forage


to travel around an area in search of food

Mother birds forage for food and return to the nest with it to feed their babies.

forage

stamina


the energy and strength needed to do something for a long time

To build stamina, swimmers spend hours swimming laps.

stamina
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