The frontendcover and the rear end cover are fixed by screws and rabbets. Meanwhile, the rotor assembly is fixed.
前、后端盖利用螺钉及止口固定，同时将转子总成固定。
2
Working groups cover visual design, simplicity, and front-end code to help ensure Facebook designs remain consistent.
整个工作组涵盖视觉设计和前端开发，这确保了Facebook的设计保持一贯的风格。
3
The ultrasonic transducer vibrates longitudinally, its frontcover plate links up with a half wavelength circular conical horn to increase the amplitude of the output end of the ultrasonic transducer.