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en echelon structures
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tech.
雁行状构造
;
雁行式构造
;
雁列
状
构造
;
斜列式构造
;
梯阵
式
构造
en echelon structure
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desert.
雁列式构造
space
雁列
行
构造
en-echelon structure
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avia.
雁列
行
构造
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