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n.
職權的等級；階層；梯隊；梯次編隊
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v.
排成梯形
Noun:
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a body of troops arranged in a line
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a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset
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The higher echelons of the law and politics have become almost an Oxford preserve.
出于：Times
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上述信息獨家首發創做，受學術著作權保護保護，抄襲必究
海詞詞典翻譯，二十七年國際品牌
美
['e??lɑ?n]