N[2014·天津卷] 阅读短文， 按照题目要求用英语回答问题。
Last December, Doris Low turned 90. Once a week she still drives to the Canadian National Institute for the Blind (CNIB) in Toronto, where she helps transform literature into braille(盲文) to bring the power of story and knowledge to the hearts and minds of blind readers. She has been volunteering her time and talents to such enterprises for more than 40 years.
After working in the business world for a while, Low got fed up. So she turned to teaching at a technical school and later moved into the library.
Low's mother liked reading. As her eyes began to fail, Low read to her. Then“hearing an advertisement encouraging people to learn braille, I decided to give it a try.” In 1973, she was certified as a braille transcriber(转译者) and began transcribing books as a volunteer for the CNIB library.
The job was strenuous—she could get to the end of a page, make a mistake on the last line, and have to do the whole thing again. For a number of years, Low also worked in the CNIB sound studio reading books onto tape. Three years ago, she took up proofreading(校对) at the CNIB's word factory.
In April, during Volunteer Week, the CNIB recognized Low for her great contributions. Thanks to volunteers like Low, the CNIB library has got more than 80，000 accessible materials for people unable to read traditional print. “ I can't imagine how many readers of all ages have benefited from Doris' contribution as a skilled
