Common shapes in fire include teardrops and tendrils for the flames and an elliptical shape for the entire space taken up by the fire.
一般火焰的形状包括火苗呈现的水滴状和卷须状，还有整个火焰呈现出来的椭圆形。
2
To test the reliability of this method, rectangular crack elliptical crack and semi-elliptical crack in infinite space and in semi-infinite space are calculated.
为了验证该方法的可靠性，本文对无限空间和半空间中矩形类、椭圆类和半椭圆类平片裂纹问题进行了计算。
3
Two coherent signals with different primary phases radiated by two orthogonal in-space linear polarization antenna elements form an elliptical polarization wave.