英汉词典

1. （机器、设备等）正常运转的，可使用的
    A machine or piece of equipment that is operational is in use or is ready for use.

    e.g. The whole system will be fully operational by December 1995.
           整个系统到1995年12月将可全面投入使用。

2. 操作上的；实施时的；运行中的
    Operational factors or problems relate to the working of a system, device, or plan.

    e.g. The nuclear industry was required to prove that every operational and safety aspect had been fully researched.
           核工业被要求证明其在运营与安全各方面都进行过充分的研究。