The microorgan-isms employed include mainly chemical conversion bacteria,phototropic bacteria and alga.
所利用的主要包括：化学转化菌、向光性菌和藻。
Auxins influence the growth of stems toward light (phototropism) and against the force of gravity (geotropism).
影响茎的向光性和背地性长。
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Let's start by talking about phototropism.
让我们先来谈谈。
Auxin will always move away from the light in positive phototropism.
在正中，生长素是会远离线移动。
And two big things that you should understand about plants are phototropism.
关你应该理解的两个重要概念之一是。
Negative phototropism would be growing in the other direction.
负就是朝相反方生长。
And so immediately when you plant a seed, the roots are going to show negative phototropism.
所以当你种下一颗种子时，根部会立即表现出负。
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划词翻译
详细解释
主要包括：化学转化
菌、向光性菌和藻
。
影响茎的
是会远离
