并不缺乏努力的无知经常是导致最终分崩离析的最主要原因。

Ignorance, not lack of effort, is often the most important cause of their ultimate downfall.

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恶劣天气的发生，尤其是雷暴，是导致空中交通延误的最主要原因，马克松说。

Episodes of bad weather, particularly thunderstorms, are the most common cause of air traffic delays, Maxson said.

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在印度，土地收购问题是导致工程拖延的最主要原因。

The single largest factor in project delays is the difficulty in acquiring land.

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