相对应的交感神经系统，一张贯穿脊椎的由神经和神经元组成的网会将信息传递到身体的每个器官，它是形成觉醒与兴奋的原因。
The sympathetic nervous system—a web of nerves and neurons running through the spinal cord and spread to virtually every organ in the body—is responsible for arousal and excitement.
这种防御机制已经为人所熟识了，而且在其他一些无脊椎动物中也有发现。 但是目前还没有报道说明是什么使得它们形成这样的机制，也不知道这是否可以有效地反抗捕食者。
This is a recognised defence mechanism and has been mentioned in other invertebrates, but no one had published on what exactly makes them do it or whether it actually is effective against predators.
这一周婴儿的脊柱更加清晰，形成了33块脊椎、150个关节和1000个韧带。
This week your baby's spinal column is becoming more distinct forming 33 vertebrae 150 joints and 1 000 ligaments.
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