BT是在二十世纪早期被发现的一种细菌。农户们把它当作一个天然杀死昆虫的方法开始泛用。之后科学家获悉到把BT基因植入棉花中的方法。
Bt is a bacterium that was discovered in the early twentieth century. Farmers started using it as a natural way to kill insects. Then scientists learned how to put a Bt gene into cotton plants.
叶中齐墩果酸含量在终花期达到最高，而花中齐墩果酸含量在盛花期达到最高，盛花期之后逐渐下降。
The oleanolic acid content in stems at flowering and early flowering stage are all high, and the early flowering stage higher than the final flowering.
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