Usually our faces form these expressions  on their own, based on the feelings we have at the moment.  Actors, politicians and some criminals learn to form various expressions with their faces that are not related to their emotions.  That makes it difficult for others to know for sure what they are really thinking or feeling.

　　Some people claim to know what a person is thinking or feeling by the look in his eyes, but the eyes do not change. What people really notice is the tiny changes in the rest of the face that surround the eyes.

　　Your eyes have many different parts.  Your eyelids are the skin coverings that slide down over your eyeballs when you blink.  Eyelashes are short, curved hairs that grow from the bottom edge of your eyelids.  Eyebrows are the short, curved hairs that grow above your eyelids.  The colored part of your eyeballs is called the cornea. Corneas can be blue, green, brown, yellow, or a combination of colors.  The pupil is a black dot in the center of your cornea. The pupil grows larger when the light is dim and smaller when the light is bright.

　　A person with no hair on his head is said to be bald.  If there is hair on some parts of the head but not on others, that person is partially bald.  A person who is loosing his or her hair over a period of time is said to be balding.

　　The glass or plastic lenses set in metal or plastic frames and supported by the nose and ears are called glasses, eyeglasses or spectacles.  If the lenses have two or three sections in them, they are called bifocals or trifocals.  Lenses that are placed directly on the eyeball are called contacts or contact lenses.

　　Below your neck is the part of your body called the torso.  Sometimes it is just called 'your body'.  The upper front part of your torso is called the chest.  The chest is like a skin and muscle-covered cage.  The cage is made of curved bones called ribs.  Inside this cage are your lungs and your heart.  Below the chest is the area called the abdomen.  Sometimes this area is also called your stomach or belly.  Inside the abdomen, or in the abdominal cavity, are located the actual stomach organ, the liver, the spleen, the large and small intestines, and the bladder.   Women also have their uterus and ovaries in the abdominal cavity.

　　 The rear part of the torso is called the back.  Within each side of the upper back are flat bones called shoulder blades.  Down through the center of the back, from the neck to the bottom of the torso, is a series of bones called the spine or backbone.  The small bones that make up the spine are called vertebrae.  The bottom end of the spine is called the tail bone.  The kidneys are located on either side of the spine inside the lower section of the back.

　　Below the back and on either side of the tailbone are fleshy mounds called buttocks.  The buttocks provide padding when we sit down.  There are many English words used to refer to a person's buttocks, but some of them are not very polite.  Here are some that are not so bad: backside, rear end, butt, posterior, gluteus maximus (the name of the main muscle in the buttocks).liuxuepaper.com