Not all wounds are superfacail.
Most wounds run deeper than we can imagine.
U can't see them with the naked eye.
And then there are the wounds that take us by surprise.
The trick with any kind of wound or desease is to dig down and find the real souse of the injury.
And once u found it,try like hell to heal that sucker.
这是实习医生格雷里的话,根据上下文,应该就是try hard to heal the patient的意思啦.