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

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

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

A young girl's joyful reaction as she chases a yellow balloon, capturing a sweet and carefree moment of childhood innocence.

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Watch as a talented breakdancer showcases his skills while balancing a glass of water on his head, without spilling a drop.

习惯可以改变一个人，好的习惯让我们变得更好，坏的习惯让我们不由自主。如何养成好的习惯，改变自己？