随着棘轮应变的产生，直管圆截面变为椭圆截面。
Thecircular cross section turns into ellipse as the ratcheting strain accumulates.
抛物面一种有与单坐标轴平行的抛物截面和与该轴垂直的椭圆截面的平面。
A surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis.
采用光线矢量法设计了两个相互垂直的椭圆截面柱透镜组来准直半导体激光束。
By using the light ray vector method, the elliptic-section cylinder lenses have been designed to collimate the semiconductor laser beam.
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