【Native Speaker每日综合训练—43系列】【43-02】科技 Mutualism

啊呀呀二十风

scientists find a kind of herbivorous spider.
the two scientists discovered the spider separately and decided to study it.
this spider was first developed by eating a kind of ant, which eats plant. gradually, the spider goes to the source and directly eat the plant.
although the spiders eat plant and they do not need to co-operate with each other to prey on other insects, they still live together.
studying the spider will illuminate a new species

啊呀呀二十风

obstacle:6'54

啊呀呀二十风

重新理了一下思路，更清楚地看到了文章的本质，开始读的时候有些只见树木不见森林的赶脚，所以没能把文章逻辑连贯起来。重写一下。
introducing a herbivorous spider
this spider lives in a tree-ant-spider system, which ant and tree live in a symbiosis
the process that the new kind of spider that eats plant was discovered independently by two scientists
the spider eats on ant larva and too many spiders will hurt the tree-ant-spider system. scientists found that the spider directly eats the plant when larva is rare.
even though the spiders do not need to live together to hunt for food, they still live with each other to some other purpose.
Studying this kind of spiders will illuminate the new species.