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relating to the national government, as opposed to a local or state government
The U.S. Congress is the part of the federal government that makes laws for the country.
to enforce the rules of a sport or game
Referees who officiate soccer games can give yellow cards and red cards to players who break the rules.
to notice or discover
Doctors use X-rays to detect broken bones.
substances that can cause an allergic reaction
Pollen is one of the most common allergens. It can cause sneezing, coughing, and watery eyes.
moved away from a dangerous area
People evacuated the village when a nearby volcano erupted.