数据压缩通常为减小文件或数据的占用空间当数据传递通信或存储时有多种压缩技术被用于节省时间和空间
Data compression is usually aimed at reducing the space occupied by files or data. When data is transmitted, communicated or stored, various compression techniques are used to save time and space
以上为机器翻译结果，长、整句建议使用 人工翻译 。