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。
The range, magnitude, or distance over which a thing extends.
范畴，广度，疆域：事物延展的范围、高度或距离。
The range, magnitude, or distance over which a thing extends.
范畴，广度，疆域：事物延展的范围、高度或距离。
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