bound auxin

例句：

1. 1.The growth hormone is essential for plant growth.
   生长激素对植物生长至关重要。
2. 2. The effect of this hormone on the body is still not fully understood.
   这种激素对身体的影响仍然不完全清楚。
3. 3. The researcher found that the bound auxin could be released by a specific enzyme.
   研究者发现，特定的酶可以将束缚素释放出来。