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...
黑麦耐贫瘠的酸性的土壤.Rye is tolerant of poor, acid soils.碳酸饮料是酸性的, 就更安全.Carbonated drinks are acidic , and slightly safer.胃传送给我的食物是高度酸性的.The food the stomach deliver to me is highly acid....