到目前为止，有关教室噪音的文献似乎都集中在它对一般的学生、他们的教师和听力受损者的影响上。
The literature to date on noise in school rooms appears to focus on the effects on schoolchildren in general, their teachers and the hearing impaired.
使您的应用程序对视力受损者可访问的第一步，是提供对将要接收焦点的组件的描述。
The first step to making your application accessible to the visually impaired is to provide descriptions of the components that will receive focus.
视力受损者约有65%在50岁或50岁以上，而这个年龄组约占世界人口的20%。
About 65 % of all people who are visually impaired are aged 50 and older, while this age group comprises about 20 % of the world's population.
应用推荐