play an indispensable role

With digital library covering the globe today, users may access knowledge and information from Internet where libraries play an indispensable role.

数字图书馆建设起来后，图书馆事业的任务、服务目标与服务内容都有了很大的变化。

As an important kind of documentation, restricted publications play an indispensable role in modern life.

内刊作为一种重要的文献资料，在社会生活中发挥着不可替代的作用。

The position detection of the spherical motor rotors, as an indispensable feedback control link, must be resolved satisfactorily, and its resolution can affect the control accuracy of the system directly and play an important role in the control system of the motor.

球形电机转子的位置检测作为电机不可缺少的反馈控制环节，其位置检测的分辨率直接影响到系统的控制精度，在电机控制系统中起到了至关重要的作用。