objectionn.反对，异议obligevt.迫使；施恩于；使感激obsessvt.(妄想等)迷住；使烦扰obsessionn.迷住；困扰Oceanian.大洋洲offendern.(法律等的)违反，犯罪者omitv.省略，删去；忽略，忘记ongoinga.持续的，继续的onlookern.旁观...
lagn.落后，滞后 vi.落后，走得慢lanternn.灯笼lawfula.合法的，法定的layoutn.布局，安排，设计leakvi.漏；泄露出去 n.漏洞；泄露lecturern.(大学)讲师lengthenvt.使伸长，延长lessenv.变小(少)，减少lestconj.唯恐，免得liab...
Mental Retardation Mental retardation is a condition in which people have lower than normal intelligence and are unable to function at the level expec...
Water Pollution The demand for freshwater rises continuously as the world’s population grows. From 1940 to 1990, withdrawal of fresh water from rivers...
Education of Students with Vision Impairments This is specially designed education for children who are either partially sighted or blind. Vision impa...
More about Alzheimer’s Disease Scientists have developed skin tests that may be used in the future to identify people with Alzheimer’s disease and may...
High Stress May Damage MemoryAccording to a report issued in May 1998, elderly people who have consistently high blood levels of cortisol don’t score ...
Dreams Studies show that in dreams things are seen and heard rather than thought. In terms of the senses, visual experience is present in almost all d...
Drug Reactions—A Major Cause of Death Adverse drug reactions may cause the deaths of over 100, 000 US hospital patients each year, making them a leadi...
In-line Skating and Injuries Increasing number of children are taking up in-line skating, and it is those new skaters who are most at risk for injurie...