序列的构造方法有剪接法，升级法，选定法以及诱导法等。

M sequence has several constructive methods such as cut-joining, spanning tree, the selected method, the induced method and so on.

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空客分管客户的副总裁John Leahy，承诺在七月份的法恩·伯勒航空展上将向公司提出升级当前飞机的建议。

John Leahy, Airbus's vice-president for customers, has promised to provide "an update" on the firm's thinking in July, at the time of the Farnborough air show.

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