瓶子，尤其已经第二年的，其内共生的生物会协助消化作用。
Digestion in the pitcher is aided, especially during the second year, by the commensal organisms that live in the pitchers.
“唯一的出路是，”莱恩博士说，“如果一个细胞以某种方式进入另外一个细胞——形成胞内共生。”
"The only way out," said Dr Lane, "is if one cell somehow gets inside another one — an endosymbiosis."
叶绿体是植物细胞内的一种重要细胞器，它起源于早期具有光合能力的原核生物与真核生物的内共生事件。
Plastids are essential organelles of plant cells and it is believed that plastids have arisen from an endosymbiotic event between a protoeukaryote and a photosynthetic prokaryote.
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