What we think we know derives chiefly from archeological evidence, which is before writing--mute evidence that has to be interpreted and is very complicated.
我们目前所认为的史实，主要都是从考古证据中所得，这些无声的证据出现于文字记录之前，因此就需要繁复的考证及解读。
Before we discuss the joint practices, let me be clear about what the practices are and are not.
在我们讨论联合实践之前，让我先明确一下什么是实践，什么不是实践。
In the past, we also issue letters before students' final year began to let them know what they needed to take in the final year to be OK, but we don't do that anymore.
在过去，我们也会在学生的最后一年开始前给他们发信息，告知他们在这一年要上什么课程才能顺利毕业，但我们现在不再这样做了。
What makes that so fascinating is that before we found the Antikythera Mechanism, the earliest device we had that could track the Sun and moon like this was invented over 1,000 years later.
让人如此着迷的是，因为在发现安提基西拉机械之前，最早能像它一样追踪太阳和月亮的设备居然要追溯到1000多年前了。
We have what at first seems like a pretty attractive theory, but then, how do you explain the fact that this has happened before?
我们提出了一开始看起来很有吸引力的理论，但是接下来，你要如何解释以前也发生过这种情况呢？
Before we do the test, we're going to calculate what we would predict, so when we do the demo it will be meaningful.
在我们做测试之前，我们先算一下我们能预知什么，这样在进行演示时会是有意义的。
Of course, he is doing now of his own free will what we could not make him do before.
当然，他现在做的事是出于他自己的自由意志，这是我们以前无法让他做的。
The only real difference between what we do, and something like Nightmare Before Christmas that you mentioned before, is the plasticine.
我们所做的和你之前提到的《圣诞夜惊魂》唯一真正的区别是橡皮泥。
The first step in awakening senses is to stop predicting what we are going to see and feel before it occurs.
唤醒感官的第一步是在事情发生之前，不要预测我们将要看到或感觉到的东西。
"Let us see what is in the other casket, before we get into a bad humor," said the Emperor.
“我们暂且不要生气，让我们先看看另一个盒子里是什么再说吧。”皇帝说。
Then we enter those data, information about what the landscape looks like before and after the wetlands were drained.
然后我们输入这些数据，它们是关于湿地排水前后景观的信息。
We had never experienced this kind of holiday before and had no idea what to expect.
我们以前从未经历过这种假期，不知道有什么可期待的。
I probably should have met with Carl earlier, before the proxy fight, to lay out what we were doing and why.
在代理权之争之前，我应该早点和卡尔见个面，告诉他我们在做什么，以及为什么这么做。
Wait, I see where you are heading with this, but before we go into how European settlement affected the ecosystem, tell me this—what kind of environment do beavers live in?
等等，我明白你的意思了，但在我们讨论欧洲人的定居如何影响生态系统之前，告诉我，海狸生活在怎样的环境中？
But before we get started, I want you to take a moment to think: does anyone know what the single most popular style for a house in the United States is today?
但在开始之前，我想让你们花点时间思考一下：有谁知道，当今美国最流行的房子样式是什么吗？
Now, what we do have clear evidence for is that people are developing friendships and professional networks in a way that wasn't possible before, the process is faster.
现在，我们确实有明确的证据表明，人们正在以一种以前不可能的方式发展友谊和专业网络，而且这个过程发展得更快了。
If God is omnipotent and knows what we will do before he created us, how can we have free will?
如果上帝无所不能并在造出我们之前就已经知道我们会做什么，那么我们如何才能够拥有自由意识呢？
We're in the world and exist before we know our purpose, before we understand that essence that provides meaning, that defines us. Our essence is what we make of ourselves.
我们存在于世界上，这一存在先于我们的目的，先于我们对本质的理解——那个提供我们以意义和界定的本质，它是我们在存在的基础上进行的创造。
Maybe slightly different each time, but consistent with what we saw before, when we ran the other program.
可能每次不一样，但是和我们之前看到的一样都是相符的，但当我们运行其他程序的时候。
We didn’t know what they were, and when we had them right before our eyes we didn’t know what to do with them.
我们不知道它们是什么玩意，就是摆到我们面前我们也不知道要怎么使用。
So, whenever there's any risk of confusion, OK, so not in the cases that we had before because what we've done until now, we didn't really have a problem.
任何情况下，都有可能出现这样的混淆，之前之所以没有出现，是因为直到现在，我们才真正地遇到它。
We learn something every day, and lots of times it’s that what we learned the day before was wrong.
我们每天都在学习，很多时候，我们以前学的都是错的。
We first decide what values (or benefits) we want to achieve before launching a project or product
在开始一个项目或者产品之前，我们首先要决定想要达到什么样的价值（或者利益）
Last two years, we are facing a massive influence of social networking and other internet-related technologies (i.e. Web 2.0) on what before we call collaboration.
过去两年，社交网络和其他以前所谓协作的互联网相关技术(如web 2.0)铺天盖地。
Before we did this study, we didn't know what the climate anomalies would be or how long they would last.
在我们做这项研究之前，我们不知道气候会有怎样的异常，这些异常会持续多长时间。
In all art we look and listen for what we have not experienced quite that way before.
在所有的艺术中，我们寻找和聆听的是我们从未经历过的东西。
Before we elect him to parliament, we want to know what he stands for.
在我们选他当国会议员之前，我们要知道他的主张。
Before we begin, let's expand on what it means to support third-party components in the development environment.
在我们开始之前，让我们探讨一下怎样在开发环境中做到支持第三方组件。
Before we begin, let's expand on what it means to support third-party components in the development environment.
在我们开始之前，让我们探讨一下怎样在开发环境中做到支持第三方组件。
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