Learn about the fundamental principles of electric circuits, including voltage, current, resistance, and common components like wires, batteries, and switches.

Footage of busy city streets on a rainy day, with people rushing to their destinations under colorful umbrellas.

记录了夕阳下田园风光的美丽景象，晚霞、金黄色的小草和摇曳的狗尾草，伴随着晚风，展现了一片宁静而美丽的乡村景色。

Take a journey through the Earth's diverse landscapes, oceans, and atmosphere, and discover the unique features that make our planet habitable.

Watch Dwayne Johnson showcase his vocal skills in this entertaining video of him singing.

Footage of busy city streets on a rainy day, with people rushing to their destinations under colorful umbrellas.

A person peels and consumes a banana in a casual setting.