So the major obstacle to the development of new supplies is not geology but what happens above ground: international affairs, politics, investment and technology.

  • -- Daniel Yergin 丹尼尔·耶金

因此,开发新能源的主要障碍不是地质,而是地面上发生的事情:国际事务、政治、投资和技术。

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However, the fact that the tanks had now been raised to such a pitch of technical perfection that they could cross our undamaged trenches and obstacles did not fail to have a marked effect on our troops.

然而,坦克现在已提高到技术上如此完美的水平,它们可以越过我们未受破坏的战壕和障碍,这一事实并没有对我们的部队产生明显的影响。

Nothing is an obstacle unless you say it is.

没有什么是障碍,除非你说出来。