"a person is blind to the extent that he must devise alternative techniques to do efficiently those things he would do with sight if he had normal vision"
unsighted是什么意思
unsightly是什么意思
unsigned是什么意思
unsisterly是什么意思
unsized是什么意思
unskilful是什么意思
unskilled是什么意思
unskillfully是什么意思
unslaked是什么意思
unsleeping是什么意思