He informed us that French scientists had determined that the optimal length of a tour guide's lecture is seventy-five minutes.

他告诉我们法国科学家研究表明导游的最佳讲解时长是75分钟。

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A study tour is the optimal way to learn a language.

出国游学是学习语言的最佳途径。

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Computer simulations show that optimal solution can be obtained using this method and the tour quality is enhanced. This method is valid for solving medium or large scale TSP.

计算机仿真结果表明，该方法可以获得最优有效解，并且解的质量明显提高，对求解中大规模的TSP比较有效。

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Chris Horner, of the Radio Shack team, said in this piece that maintaining an optimal diet during the Tour is tough.

FORBES: What Fuels Tour De France Riders?