But the agricultural extension system is now in some disrepair.
然而，此项农业推广体系如今已年久失修。
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。
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。
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