Ключевые слова: alternative, ancient, animal, annelid, anxiety, biology, blood, bloodletting, bloodsucker, bloodsucking, care, closed, dangerous, detoxification, disgust, doctor, education, glass, healing, health, healthy, hemolymph, hermaphrodite, hirudo, hirudotherapy, hospital, invertebrate, jar, leech, leeching, medical, medicinal, medicine, microbiology, nature, paraphyletic, parasite, parasitic, physic, pot, relief, ricefieldcrabs, science, skin, suck, sucker, therapy, water, wet, worm,