从大量使用农药来防治病虫草害至今的几十年里，农药的使用对人类和社会的贡献是全世界人们都有目共睹的。
From the large use of pesticide to control pest to today, the contribution of the use of pesticide for human and social is known all over the world.
但是上世纪食物的巨大需求导致化学合成农药在世界范围内大量使用，尤其是滴滴涕和类似的农药问世以后。
But a growing demand for food drove a global shift to synthetic pesticides last century, especially once DDT and similar insecticides hit the market.
赤霉素(GA3)是一种植物生长调节剂类农药，当大量使用时会产生一定毒性。
Gibberellin (GA3) is a kind of plant growth regulator pesticides. When GA3 is used excessively, it would produce a certain toxicity.
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