Ключевые слова: aid, alternative, animal, annelid, background, biology, bite, blood, bloodsucker, bloodsucking, body, care, cell, closeup, detail, disease, doctor, extreme, green, health, hermaphrodite, hirudo, horizontal, hospital, illness, invertebrate, isolated, leech, light, macro, medical, medicinal, medicinalis, medicine, microbiology, nature, parasite, parasitic, research, science, slice, small, suck, sucker, therapy, treatment, wet, white, worm,