TripIt is an intelligent travel organizer that helps do-it-yourself travelers manage their travel plans so that their trips go more smoothly.

TripIt是一个智能旅游组织网站，帮助自助旅客管理自己的旅行计划，让他们的旅程更为轻松。

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And a new print-it-yourself travel guide called Offbeat guides (still in beta as of June 2008) culls information from the site to create custom travel guides tailored to the exact dates of your trip.

新推出的名为“Offbeat Guides”的旅游指南(2008年6月推出，现为测试版)可自行打印。指南收录了网站中与旅游相关的信息，用户可根据确切旅行日期来编写相应旅游指南。

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Either put it to the test yourself, or help out someone who is trying to travel hopefully with his thumb outstretched.

你可以自己试一试，也可以帮助那些请求搭便车、满怀希望地去旅行的人。

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c We know it's very specific for light because in this equation is c, the speed of light. So any time you go to use this equation, if you're trying to use it for an electron, just ask yourself first, does an electron travel at the speed of light?

我们知道它只对光适用是因为在这个方程里有,光速，所以下次你们用这个方程前，如果你们要把它用到一个电子上，先问问你自己，电子的运动速度是光速吗？

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