英国有170万失明和视力受损人口。There are 1.7 million blind and visually impaired people in Britain.他将失明的双眼转向他们，低声打了个招呼。He turned his sightless eyes their way and boomed out a greeting.在受污染严重的地区，有一半人口失明。In heavily infected areas, half ...
普利茅斯海洋研究所的科学家一半有学士学位，另一半则有博士学位。Half of PML's scientists have first degrees, the other half have PhDs.瑞安博士周游世界为他的书搜集资料。Dr Ryan travelled the world gathering material for his book.梅西伯夫博士阐述了他的教学方法的基础。Dr. Mesibov set fo...