他们可以受到永久性的操作或启动制动特性。
They can be subjected to both permanent operation or to start-brake characteristics.
发射后差不多三天时间，制动火箭启动了，阿波罗8号飞船进入了月球轨道。
Nearly three days after launch, the braking engines fired and the Apollo 8 capsule went into orbit around the moon.
每列列车底部都安装了一个“黑匣子”，如果检测到可能影响列车运行的障碍物，可以在1.4秒内启动紧急制动。
A "black box" has been installed at the bottom of each train and it can activate emergency braking within 1.4 seconds if obstacles that might affect the running of the train have been detected.
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