Biologists compared the respiratory systems of different amphibians to understand their evolution.

The mechanic inspected the car's intake system for leaks before the test drive.

After hearing a rattling noise from under the car, the mechanic inspected the exhaust system and discovered a cracked catalytic converter and a corroded silencer.

He developed a moral system grounded in compassion and respect for all living beings.

Researchers often model dynamic systems using differential equations to predict future states.

Many modern buildings rely on alarm systems to detect smoke, intrusion, and other hazards.

To visualize complex data, scientists often switch among several coordinate systems when plotting multidimensional results.

Researchers compared the architectures of distant planetary systems to search for patterns.

Astronomers discovered several new star systems in the dense halo of the galaxy last year.

The university cafeteria operates on an honour system where students pay for their meals voluntarily.