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The term "Learning Disabilities" means a disorder in one or more of the basic psychological processes involved in understanding or in using language, spoken or written. The disorder may (36) itself in an imperfect ability to listen, think, speak, read, write, spell, or to do mathematical (37) , including conditions such as perceptual disabilities, brain injury, (38) brain dysfunction and dyslexia (诵读困难). The term does not include learning problems that are primarily the result of (39) or hearing disabilities, of mental delay, of emotional (40) , or of environmental, cultural, or economic disadvantage. Learning disabilities can be (41) by things that happen before or during birth. For example, a mother may have an (42) , such as German measles. Or a baby does not get enough (43) while it is being born. Sometimes a childhood illness, such as meningitis (脑膜炎), can cause learning disabilities. Who have learning disabilities (44) What are the health concerns of people with learning disabilities (45) . Are people with learning disabilities at risk of abuse (46) .