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对长时间运行的会话做上下文裁剪，只保留必要的历史信息。，更多细节参见爱思助手下载最新版本
local_ip = 127.0.0.1，更多细节参见Safew下载
Casting floats to short ints however implicitly calculates a mod operation (in fact mod 65536 for each float in the tuple).
Many small compilers, Appel's textbook