... extend/retract the gear 放下/收起落架 emergency extension system 紧急放下系统 crank the gear down 人工放下起落架 ...
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An emergency extension system extends the gear mechanically if hydraulic or electrical power is lost.
如果液压系统或者电源出现故障，应急放出系统会靠重力机械地放出起落架。
Developing an efficient Railway Emergency Communication System was important to reduce the loss of accident, prevent the extension from the disaster.
开发高效的铁路应急通信系统有利于减少事故损失，防止灾害扩大，这对于保障铁路的运输安全是至关重要的。
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