- air tramping
- 不定期: irregularly scheduled; non s ...
- 空运: air transport; airlift
- 定期空运: regular service; scheduled airlift
- 不定期: irregularly scheduled; non scheduled◇不定期 (航线货)船 tramper; 不定期存款 irregular [undated] deposit; 不定期航班 nonregular service; 不定期航线 tramp route; 不定期货船 tramp; tramp steamer; tramp ship; tramp vessel; 不定期货船提单 tramp bill of lading; 不定期检查 casual inspection; 不定期刊物 publication issued at irregular intervals; 不定期喷发火山 volcano of unperiodical eruption; 不定期运输 tramping; 不定期远洋货船 ocean tramp
- 民用航空运输不定期飞行管理暂行规定: interim provisions governing non-scheduled flights in civil air transport
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