The main duties of forest guards are: patrol the forests and prevent forest resources from being destroyed.

护林员的主要职责是：巡护森林，制止破坏森林资源的行为。

youdao

Their main duties are to ensure safety of navigation and other Marine activities as well as to respond to emergencies.

他们的主要职责是确保船舶航行及其他海事活动的安全，遇有紧急事故则立即动员应变。

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The article introduces the main principle of comprehensive standardization in developing products types, as well as the main duties and contents of standardization in every stage.

本文介绍了在产品型号研制工作中开展综合标准化的主要原则以及研制各阶段标准化工作的主要任务和内容。

youdao

Along with the peace-keeping force will be military observers, staff officers and civilian police and among its main duties will be assisting preparations for next year's elections.

BBC: NEWS | Africa | UN peace force for Ivory Coast

Creative incompetence will achieve the best results if you choose an area of incompetence which does not directly hinder you in carrying out the main duties of your present position.

ECONOMIST: Guru

We're still some distance away from once again hopping on Dreamliners for long-haul flights, but the aircraft will at least have a chance to flex their muscles before they resume their main duties.

ENGADGET