in echelon
短语词组
- official in lower echelon 下級官員
- officials in lower echelon 下級官員
- fly in echelon 梯隊飛行
- squadron in echelon 梯次配置的中隊
- flying in echelon 成梯隊飛行
- fly in echelon formation 梯次編隊飛行
- overall enrichment in echelon 梯次綜郃富集
- aircraft flying in echelon 成梯隊飛行的飛機 返回 in echelon