A mesmerizing animation of a wave ripple effect on a white background, creating a sense of depth and immersion.

A young female teacher explains and demonstrates how to define variables in JavaScript, covering the basics of variable declaration and usage.

A simple and cheerful hello to brighten your day.

A person enters from the left, walks, sits in a box, and undergoes a transformation from sadness to happiness before exiting to the right.

A person reacts to a confusing or chaotic situation in Russian, expressing frustration and surprise.

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？

Learn about Mars, the 4th planet from the Sun, its reddish appearance, and its size and distance from the Sun, with a diameter of 6,792 km and an average distance of 225 million km.