That's something we humans have trouble enough with, let alone a single-celled organism without a neuron to call its own.
这对我们人类是够麻烦的，让一个没有神经的单细胞生物拥有自己的意愿。
Among the 2, 900 known snakes, few are dangerous, let alone lethal, to humans, but prejudices run deep.
在已知的2900种蛇中，很少是危险的，能使人致命的就更少了，但人类对蛇的偏见依然很深。
Anxiety born in human genes is well enough to give people a hard time, let alone the lifelong anxiety caused by death. It is said that this innate anxiety disorder doesnot only affect humans.
就不用说死亡能让我们一生焦虑了，人类基因中自身携带的焦虑就足以让人们焦头烂额了，这种与生俱来的焦虑症候据说并不是人类的专利。
Very few humans get to spend carefree months exploring the world beyond their hometown, let alone during college.
很少有人能够花费几个月无忧无虑的时光，去探索家乡外面的世界，更不要说在大学期间。
Humans are failing at this time to understand what a proper diet requires to sustain the current level of consciousness, let alone ascend into a new higher level of consciousness.
今天的人们并不懂得需要怎样一个适当的饮食来维系当前的意识水平，更遑论提升到一个更新更高的意识层次了。
Humans are failing at this time to understand what a proper diet requires to sustain the current level of consciousness, let alone ascend into a new higher level of consciousness.
今天的人们并不懂得需要怎样一个适当的饮食来维系当前的意识水平，更遑论提升到一个更新更高的意识层次了。
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