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"The constipation of so many students in the hallway made it difficult to move around. "

"My uncle is a professional engineer. "

"My grandfather is a birdwatcher and can identify almost any bird by its song. "

"Many Australians are working to preserve the culture and traditions of the Aboriginals. "

"strengthen a muscle"

"The bright red stripe is distinguishing that brand of running shoe from all the others. "

"The cell phone emits electromagnetic waves that allow us to communicate. "

"The large oak tree surrounding the picnic area provided welcome shade. "

"The detective is identifying the suspect in the security footage. "

"Scientists used electrophoresis to separate the different DNA fragments in the sample, allowing them to identify the suspect in the crime. "

"The ornithologist observed the birds migrating through the park. "

"Chemists used chromatography to separate the different colored dyes in the marker ink. "