You can demonstrate this process by simply turning faces upside-down, showing that our ability to pick out differences is suddenly reduced.
你可以通过简单地把脸倒置过来来演示这个过程，表明我们辨别差异的能力突然下降。
2
Just one night of tossing and turning and getting only four hours' sleep can 'profoundly' affect the body's ability to use insulin to convert sugar into energy.