叶绿体是植物进行光合作用的细胞器，“内共生学说”认为叶绿体起源于蓝藻类的原核生物。
Chloroplast is an organelle specialized for carrying out photosynthesis in plants and descended from cyanobacteria according to endosymbiosis.
弗洛姆的“逃避自由”学说，把自由的获得与自由的丧失视为是共生的两极，人类越是获得自由，也就意味着越是丧失自由。
Fromm's theory, "escape freedom", regards gaining freedom and losing freedom as the two extremes of the intergrowth, which means the more freedom human beings have, the more freedom they lose.
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