mean length of turn

例句：

1. 1.The car needed to slow down to avoid hitting the mean length of the turn.
   为了不撞到转弯半径，汽车需要减速。
2. 2.The engineer calculated the mean length of the turn to determine the safe speed limit.
   工程师计算了转弯半径来确定安全速度限制。
3. 3.The driver had to make a sharp turn at the mean length of the turn.
   司机必须在转弯半径处急转弯。