octal (numeration) system

例句：

1. 1. The computer uses a decimal system for its calculations.
   计算机使用十进制系统进行计算。
2. 2. Octal numbers are used in some programming languages to represent binary data.
   在一些编程语言中，八进制数用于表示二进制数据。
3. 3. The engineers used the octal system to communicate with each other efficiently.
   工程师们使用八进制系统来高效地相互沟通。