When there's excessive force from outside, the two membranes may pull apart, so that blood which should have been flowing in the inner membrane leaks out and causes a stroke. "
「血管有內膜與外膜兩層，緊緊貼在一起，當外力過強時很容易造成內、外膜剝離，以致原本應在內膜中流動的血液外流出來造成溢血中風。」