curvature of meridian

例句：

1. 1. The curve of the river isbeautiful.
   这条河的曲线很美。
2. 2. Thestraight line is faster than the curvedpath.
   直线比曲线路径更快。
3. 3. The curveof the road is quite steep.
   这条路的曲线相当陡峭。