brachistochrone with bounded curvature

例句：

1. 1. The athlete's brachistochrone was measured at 2 meters.
   运动员的臂长为2米。
2. 2. The team's performance exceeded the expected brachistochrone.
   团队的表现超出了预期的臂长。
3. 3. The scientist used his long arms to reach the far end of the table.
   科学家利用他长长的手臂，到达桌子的另一端。