So, well, maybe we want to understand first what happens if we move inside the level curve, OK?
我们首先要理解,移动到等值曲线的内部会发生什么？
He was glad no one asked him what first impressions are; they were all too busy looking their best.
他很高兴没有人问他第一印象是什么；他们都忙着打起精神。
He thinks that's the first step in understanding what they are saying.
他认为那是理解他们所说内容的第一步。
You see, the first "videophones"—that's what they're called—were made in Japan, but they can only show a still black and white image, so this videophone is much better than that.
你看，第一批被称作“可视电话”的设备是日本制造的，但它们只能显示静止的黑白图像，所以这款可视电话要比那款好得多。
"O, we're not off yet, if that's what you mean," replied the first swallow.
“啊，如果你是这个意思的话，我们还没有走呢。”第一只燕子回答说。
Ceres was the first and is the largest of what became many objects discovered at that same distance.
在同样的那个距离发现了很多天体，谷神星是其中第一个被发现的也是最大的天体。
When you have to say something in English, think first and ask yourself" What words and phrases do I know in English that I can use in this situation?"
当你必须用英语说某事时，先问问自己“我知道什么英语单词和短语在这种情况下可以用上？”
The first of our three brains to evolve is what scientists call the reptilian cortex.
我们三个大脑中最先进化的是科学家们所称的爬虫脑皮质。
When he first came home he wouldn't say anything about what he'd been doing.
刚回到家时，他对自己一直在做的事只字也不愿提。
Looking to the future, though, we asked him what the prospects are for a vaccine to prevent infection in the first place.
然而，展望未来时，我们首先问他一种预防传染的疫苗前景如何。
"I shall make you tell me about Rajahs presently," he said, "but first tell me what the second thing was."
“你以后再告诉我印度王公的事，”他说，“先告诉我第二件事是什么。”
First, you are sorry for what you've done, and you see the folly of it all?
首先，你为你所做的事感到抱歉，你明白这一切是多么愚蠢吗？
This is the first instance in which Richard will do what he later describes Mencken doing, using words as weapons.
这是理查德第一次做他后来描述门肯所做的事，用语言作为武器。
You won't know what he means at first, for it is difficult to understand him.
起初你不知道他是什么意思，因为很难理解他。
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？
Leaving the main stream, they now passed into what seemed at first sight like a little land-locked lake.
离开了主河道，他们进入了一个乍一看像是一个内陆湖的地方。
I thought we could start by asking our audience what car engines were first designed to run on-fossil fuels or biofuels.
我想我们可以先问问观众哪种汽车引擎被最早设计为使用化石或生物燃料。
What's strange to me though, is that at first film music didn't necessarily correspond to what was on the screen.
但让我感到奇怪的是，一开始电影音乐并不一定要与屏幕上的一致。
Much of the potential for European economic development lay in what at first glance would seem to have been only sleepy villages.
欧洲经济增长的大部分潜力存在于一些小镇中，那些乍一看似乎很寂静、冷清的小镇。
She did not know what it was, because at first, she could scarcely distinguish it from the wind itself.
她不知道那是什么，因为起初她几乎不能把它和风本身区别开来。
You'd better test your fitness level first to decide what activities you need.
你最好先测试一下你的体能水平，以决定你需要什么样的活动。
She remembered what the first aid book said about it.
她记得急救书上是怎么说的。
We can never predict what a first word is going to be.
我们永远无法预测第一个单词会是什么。
At first, I didn't know what to say, but luckily, she was really friendly.
起初，我不知道该说什么，但幸运的是，她真的很友好。
What is Li Lei's first lesson on Wednesday?
李雷周三第一节课是什么？
At first, I did not know what the word "exam" meant.
起初，我不知道 “exam” 这个词是什么意思。
Before you listen, you can read first and find out what the song is about.
在听之前，你可以先读一读，弄清这首歌是关于什么的。
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