He was a printer by trade and naturalist by avocation.他从事印刷业，同时是个博物学爱好者。The English naturalist W. H. Hudson was born in Argentina.英国博物学家W. H. 哈得逊出生在阿根廷....the prominent naturalist and broadcaster, Sir David Attenborough....
The tracking precision is got by measuring the far - field facula posit.通过测量回馈光远场光斑的位置变化可以得到端机的跟瞄精度.This paper discusses the design of deformable mirror in order to obtain special facula.本文就此叙述了变形镜面形的设计,以得到指定形状的光斑.So a n...