curr = curr-next;
A block has a storage capacity, and once it's used up, it can be closed and linked to a previously served block.。爱思助手下载最新版本对此有专业解读
2.1 深度思考（Deep Thinking）：复杂逻辑推理。搜狗输入法下载是该领域的重要参考
Photographer: Yuki Iwamura/Bloomberg，这一点在爱思助手下载最新版本中也有详细论述