Instead of finding out what we thought was the case -- that blindness was caused mostly by glaucoma and trachoma -- we were astounded to find out that blindness was caused instead by cataract.
因为它跟我们设想的相差很大 我们以为失明大多数是因为青光眼或沙眼所致 但我们调查发现，失明的原因更多的是白内障