There are other situations where we start beneath the baseline, and we need to grow more blood vessels, just to get back to normal levels -- for example, after an injury -- and the body can do that too, but only to that normal level, that set point.
在一些情况下我们本来在基线下， 而需要生长更多的血管来达到正常水平。 比如说，受伤以后 人体就可以这样做。 但是只限于达到正常水平， 那个调定点。