If you feel tired to the point of losing visual focus, you should definitely not be operating heavy machinery - no matter what.

如果你感到疲劳到失去视觉焦点这一极限时，无论如何，你都应该坚决不再操作大型机器。

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Using themes, you can (for example) mimic the look and feel of another operating system (see Figure 1).

使用主题，可以(例如)模拟另一个操作系统的观感(参见图1)。

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Most teenagers feel no difficulty in learning and operating computers.

绝大部分青少年在学习和操作电脑方面并不觉得困难。

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It would put Windows 8 on the map in a big way and give a lot of people a lot of reason to try out an operating system that is going to feel rather different than previous incarnations.

ENGADGET: Microsoft Surface for Windows RT tablet coming October 26th for $199?

Did he feel himself trapped into co-operating as a means of proving his anti-Jacobin credentials to a suspicious and conservative establishment?

ECONOMIST: British poets

Foreign information gathering agencies operating within the United States, however, feel no similar compunction to respect the privacy of American citizens.

FORBES: The Petraeus Affair and the Risk of Blackmail: Another Nail In America's Coffin