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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.
源于：Times
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這方面獨家寫作，受經典名譽權呵護，侵犯著作權必究
海詞英語詞典，十二年的品牌
美
['e??lɑ?n]