The application has three main functions.

这个程序有三大主要功能。

youdao

There are three knobs that represent the three main functions: the alarm clock, the radio and the sleep options.

有三个按钮，分别代表三个主要功能：闹钟、广播和睡眠选项。

youdao

The system operator has three main functions : transfer (inter-regional and international transit), process control and balance of the electric power system.

系统操作器有三大主要功能：传送（地区间和国际中转）、程控和电力系统平衡。

youdao

The Government of Wales Bill contains three main elements, the first - a proposal to separate the executive and legislative functions of the Assembly has proved largely uncontroversial.

BBC: NEWS | Programmes | Politics Show | Wales: Assembly powers