Perform crane ballast sequence, or any other sequence.

执行起重机镇流器序列，或任何其他序列。

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According to the special requires of bridge crane, it adopts the vector control theory, has functions of regulating speed smoothly, energy feed back, sequence brake etc.

本文介绍了一个控制桥式起重机的变频调速系统，它根据桥吊的特殊性能要求，采用矢量控制方式，具备平滑调速、能量回馈、顺序制动等功能。

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The last stage in the sequence will see a hovering, rocket-powered crane lower the rover to the ground on nylon cords.

BBC: Nasa's Curiosity Mars rover set for high risk landing

It depends on hypersonic gliding maneuvers, the largest supersonic parachute ever deployed, eight hydrazine rocket engines firing in sequence and an elaborate system of tethers called a "sky crane" that are meant to lower the landing craft gently to the ground.

WSJ: NASA's Robot Lab Curiosity Nears Mars