望远镜的物镜必须精确置于中心上.The object glass of a telescope must be accurately centred.此物镜仅产生很小的散射光.This objective produces only very little scattered light.由单透镜组成的物镜可作目视和照相观测用.Objectives which consist only of one lens can be used f...
He's a Princeton-educated Texan.他是受过普林斯顿大学教育的得克萨斯人。He liked to think of himself as a Texan.他喜欢以得克萨斯人自居.Andrew was surprised to see tears brimming in the burly Texan's eyes.安德鲁惊异地瞅见这个健壮的得克萨斯人两眼泪水盈眶....