It appears to involve more primitive aspects of the brain, activating deep structures that may block pain at a spinal level — similar to how opioid analgesics work.
这似乎涉及到大脑更原始的问题，激活深层结构可能会阻止在脊椎级的疼痛-与阿司匹林片类镇痛药的作用相似。
IN ALL BIOLOGICAL SYSTEMS, FROM THE most primitive to the most advanced, the basic building block is the cell.
从最低等到最高等的生物体，细胞都是最基本的结构单位。
This result shows that an identity-based signature scheme can be used as a primitive block to design more complicated cryptographic protocols.
这一结果表明基于身份的数字签名方案可以作为安全的密码原语用于构建更复杂的密码协议。
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