an area that you are not able to see, especially the part of a road you cannot see when you are driving, behind and slightly to one side of the car

It can be very dangerous if there's a vehicle in your blind spot. 如果车辆出现在盲区，将是十分危险的。

a subject that you find very difficult to understand at all, sometimes because you are not willing to try

I am pretty good at English, but I have a blind spot where spelling is concerned. 我英语学得不错，但在拼写方面有比较薄弱。