rate-of-climb control

例句：

1. 1. The climber used a device to rate his speed on the mountain.
   登山者使用一种设备来测量他在山上的速度。
2. 2. The climber's safety was closely monitored during the ascent.
   攀登过程中，安全受到密切监控。
3. 3. The climber had to slow down to avoid overexerting himself.
   攀登者不得不放慢速度以避免过度劳累。