"Tall and thin" is a common Engpsh expression used to describe someone who is both tall and thin. It can be used to describe a person's physical appearance, or it can be used more generally to describe any object or thing that is both tall and thin.

The phrase "tall and thin" is made up of two adjectives, "tall" and "thin," which are used to describe the height and the size or width of something or someone. "Tall" is an adjective that means having a greater height than most others of the same age or same type. "Thin" is an adjective that means having a small width or thickness in comparison to the height.

Here are some examples of how "tall and thin" can be used in sentences:

He is tall and thin, with long, slender legs. (他又高又瘦,有长长的修长的腿。)
She is a tall and thin woman with a narrow waist. (她是一个高且纤细的女人,有一个窄腰。)
The tall and thin tree stood out against the sky. (那棵又高又瘦的树在天空中显眼。)