growth rate

名词 growth rate:

1. the rate of increase in size per unit time
   同义词：rate of growth

1. A slight curving or circular movement in a stem, as of a twining plant, caused by irregular growth rates of different parts.
   转头运动植物茎的轻微弯曲或扭转的生长，象双生树那样，由不同部分的不规则生长速度引起