growth substance的用法和樣例：
例句
- You should spread some growth hormone on the crops.
你應該給這些莊稼施一些生長素。 - The foreskin cells are grown on substrates, resulting in layered matrices that secrete growth factors.
因為包皮細胞可在培養基上繼續生長，形成層層的基層，並能分泌出生長素。 - Hence, the biological grow-helping and the fast-growth and high-yield power have a substance foundation in improving the ability of frost-resistant of the seedings.
因此，生物助長劑和速生豐產靈等化控物質具有提高苗木抗寒性的物質基礎的作用。
