translation.en: But sometimes --  But sometimes I also do get -- I wouldn't call it hate mail -- but letters of really strong concern: "Dr. Hong, are you insane, trying to put blind people on the road?
translation.zh: 但是有时--  但是有时我也会收到-- 我不觉得它是带有攻击性的信-- 而是些十分强烈关注的信： “洪博士，你疯了吗， 试着让盲人开车上路？