The dog's main duty will be to accompany me on long nocturnal walks.

那只狗的主要职责将是陪我走长途夜路。

《柯林斯英汉双解大词典》

This server's main duty is handling name-related tasks.

此服务器的主要职责是处理名称相关的任务。

youdao

First, the main duty of college students is to study.

第一，大学生的主要责任就是学习。

youdao

"My main duty will be to fight for Wrexham and north Wales, " he said.

BBC: Marek - Welsh election history

He noted that any decision would have to be approved by the full College of Cardinals, given that the main duty of a cardinal is to vote in a conclave.

NPR: British Cardinal To Skip Papal Conclave

The airlines originally hired nurses to serve as flight attendants, but by the postwar era, trained health-care workers were long gone and the airlines were looking for attractive, unmarried young women whose main duty would be to serve drinks and meals.

NPR: Excerpt: 'When Everything Changed'