The machines used to generate them still rely resolutely on vacuum tubes.

产生X线的机器到现在还是完全依靠真空管。

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California was no Switzerland: much of it was still empty, geographically isolated and an institutional vacuum.

加州不是瑞士：它的大部分地区依然空荡，地理上隔绝，是一个制度真空。

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By Wednesday this week, those things were still on my list: dust, sweep, mop, vacuum, and clean the bathrooms.

这周三，我还没需要做：除尘、扫地、拖地、吸尘和清洁浴室。

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The lessons from disruptive innovation suggest that these technologies may never be as good as the absolute best human tutor (for example, the raw capacity of vacuum tubes still outpaces that of transistors, which disrupted the vacuum tubes in the consumer electronics market), but they will be plenty close.

FORBES: How Machine-Based Tutoring Could Disrupt Human Tutors

DEC's service organisation and its customer relationships, some of which have been cultivated since the days when vacuum tubes were still warm.

ECONOMIST: Compaq goes after Big Blue

In politics, there is still something of a vacuum.

ECONOMIST: Albania: Hold your breath | The