Tongue twister" is a distinctive language art form.

It refers to an expression that is difficult to articulate clearly, as is composed by words of similar pronunciations but different meanings.

For example, “Peter Piper picked a peck of pickled pepper” is such an English tongue twister.

However, in Chinese, it is the additional four tones – high level, rising, falling-rising and falling, of which all Chinese words have one as its value, that also help to make up a tongue twister.

Anyway, it is good way of practicing your Chinese pronunciation and tones through those interesting tongue twisters.