通信中的数据压缩、解压缩。存放原始数据与与此数据的差值。差值超出范围后更新原始数据。（编程背景为温室温度测量，限定在正负50以内）。已经编译通过。-Communications data compression, decompression. Storage of raw data and the difference with this data. Margin beyond the scope of the original data after the update. (Programming background greenhouse temperature measurement, limited to within plus or minus 50). Has been compiled through.