He retired in 1970, on his fiftieth birthday.他在1970年自己50岁生日时退了休。A golden wedding is the fiftieth anniversary of a marriage.金婚是结婚五十周年纪念日.Dartmouth College just marked the fiftieth anniversary of that summer study.在那个夏季研究上...
The stewards all wore armbands.乘务员都戴了臂章。Organisers had consulted widely with police, stewards and safety officers to ensure tight security.组织者广泛征询了警方、管事和保安的意见,以保证绝对安全。The stewards' badges are made so they do not uns...
生理学的产生和发展; 前馈控制特点及生理意义.Physiological production and development; The characters and physiological meaning of Feed - forward control.前馈校正的引入克服了电压均值反馈控制快速性不好的缺点.The introduction of feedforward enhance speediness of this co...