求翻译：向日葵的茎部含有一种奇妙的植物生长素。这种生长素非常怕光。一遇光线照射，它就会到背光的一面去，同时他还刺激背光一面的细胞迅速繁殖，所以，背光的一面就比向光的一面生长的快，使向日葵产生了向光性弯曲。是什么意思？

Sunflower stem contains a wonderful plant growth hormone. This hormone is very sensitive to light. A case of the light and it will go to the backlight side, and he also stimulate the backlight side of the cells multiply rapidly, so the backlight side of the light side than to grow fast, so that sunf

sunflower stem containing a strange plant growth in quality. This growth is very afraid quality optical. In case a light, then it will have to go to the back side, and at the same time he also stimulate backlit a rapid multiplication of cells, therefore, the back-side to side than on the fast growin

Sunflower's stem department includes one kind of marvelous auxine.This kind of growth hormone fears the light extremely.As soon as meets the light illumination, it can arrive the back light to go at the same time, simultaneously he also stimulates the back light at the same time cell rapid reproduct

Sunflower stem containing a strange plant Auxin. This kind of growth hormone is very afraid of the light. A case of light, it would have to go to the back side, at the same time he also stimulate cells immediately propagation of backlight, so side than to the light side of the back light grow fast,

Sunflower stem containing a strange plant Auxin. This kind of growth hormone is very afraid of the light. A case of light, it would have to go to the back side, at the same time he also stimulate cells immediately propagation of backlight, so side than to the light side of the back light grow fast,