1)beam limiter,限束器2)collimator subsystem,限束器子系统3)light beam of finite size,有限束宽光
用法例句
X-RAY collimator subsystem is the important part of X-ray machine, and its main function is confine the scope of X-ray beam, to reduce the radiation harm to Patients; Another function is realizing the multi-scope exposure on one film working with the film motion and shielding system.