Putting water into the lens' chamber turns the normally flat lens a convex hemisphere.

将水注入镜头的腔中时，会把平时平面的镜片变成凸出的半球。

Sophisticated tensioning, positioning and aligning devices are normally installed between the unwind and wind-up stations to ensure flat, smooth edged rolls at high production speeds.

先进的拉伸，定位和调整装置，通常安装在展开和缠绕点之间，以确保平整、边缘光滑的辊轴高速生产。

Normally, various shape steel materials required to pass through forging extrusion processing, and just purchased a flat plate were present in the plane of the physical properties.

一般情况下，各种形状的钢材物料需经过锻造挤压处理，而刚购入的钢板则呈现出平直平面的物理特性。