Improvements in design, materials and manufacturing mean that today's vehicles can be operated safely longer than ever, albeit at the cost of continuous maintenance and repair.

设计、材料和制造工艺的改进，意味着今天的汽车安全行驶寿命比以往任何时期都长——尽管车主必须不断的进行维护和维修。

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In this paper, we introduce a new concept of generalized derivative, and derive its operational rules and the mean value theorem of continuous functions.

文章提出了一种广义导数的概念，得到了广义导数的运算法则，以及连续函数的中值定理。

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Well you know we're at a pretty difficult time in our fortunes, I mean we, we, I mean it was understandable that the Conservatives might have lost in 1997 after 18 continuous years.

BBC: News | BREAKFAST WITH FROST | STEVEN NORRIS CONSERVATIVE VICE CHAIRMAN