parabolic crack的用法和样例：
例句
- The problem of an elastic plane having symmetric parabolic crack is discussed.
摘要研究含轴对称抛物线曲裂纹平面弹性问题。 - Classical complex variable method is followed, but a new conformal mapping formula is proposed so that the exterior part of the parabolic crack is mapped into a unit circle.
采用了传统的复变函数保角映射法，给出了一个新的保角变换公式，从而将抛物线曲裂纹外的区域映射到一个复平面的单位圆内。
