One level, two liters, three turns and four drops. The first sound should be read high and flat; The second sound is neither high nor low at first, and then rises immediately; The third sound reading should be reduced first and then increased; When reading the fourth tone, you should rise first and then fall. Generally speaking, it is "one level, two liters, three turns and four drops".
The meaning of the letter o
O: A zero, a creation without identity.
O: A complete form, a circle that can contain the world.
O: A mirror, constantly monitoring the stains.
O: Things always go round and round.
O: Earth, take good care of this human home.
O: Open your eyes and see the world.
A ball, a toy.