However, the thing to remember is, when you look at heats of reaction under those conditions it's all well and good.

相反，需要记住，当你需要知道反应中放出的热量时,这些量是很有用的。

麻省理工公开课 - 热力学与动力学课程节选

And you're telling them about what's useful in life, what you need to do in life.

你在告诉他们生活中什么是有用的，什么是你们必须做的。

It's important 课堂 - SpeakingMax英语口语达人

So, whether or not the email is addressed specifically to you in like the two field or if maybe you were BCC'd or it's a big email list of which you're just part, that could signify that this is in fact useful for you.

所以，不管这个邮件是不是,单独发给你的,或者这个邮件有一个大的邮件列表,而你正在其中，其实这也暗示了,这个邮件对你是有用的。

哈佛公开课 - 计算机科学课程节选

And one of the things that was useful here is, that we actually know that the set of primitives that you want to use is very straight-forward.

这儿有一个很有用的东西是，我们实际知道你想用的,一系列基本类型是非常明显的。

麻省理工公开课 - 计算机科学及编程导论课程节选

And it's actually critically important to get used to things because it's a useful adaptive mechanism to keep track on new events and objects.

而习惯化实际上也是至关重要的,因为这是一种非常有用的适应机制,可以让你注意到新鲜事物。

耶鲁公开课 - 心理学导论课程节选

- And it's worth--; it's sort of a useful test for asking yourself -- what are the things you must value in life-- to ask, what would you choose to do if you knew you had five years, ten years, ? what have you?

而这值得;,这算是一种很有用的测试,用来问自己什么是你在生命中必须珍惜的事-,问你会怎么选择,如果你知道自己还有5年，10年，之类的时间？

耶鲁公开课 - 死亡课程节选

But as long as you remember that distinction, it's a very useful pattern.

只要你记住了二者的区别，这将会是一个非常有用的句型。

How can I 课堂 - SpeakingMax英语口语达人

If you're going into any science that uses mathematics, chemistry, or engineering, or even economics -- you should find the contents of that useful.

如果你要进入任何要使用数学的理工科专业,比如化学,工程,甚至是经济学,你会发现书上的内容很有用

耶鲁公开课 - 基础物理课程节选

So if you learn how to look at films and if you are a real film buff, even bad movies will be useful, because they will give you things to develop your sensitivity toward the nature of film itself.

所以如果你们可以学会如何看电影,如果你们真的对电影了如指掌，即使是不好的电影也会很有用，因为,它会培养你对,电影本质的敏感程度。

麻省理工公开课 - 电影哲学课程节选

I agree is a useful pattern for nodding your head with someone for coming to a similar place.

当你对别人的想法点头称是时，I agree 是一个非常有用的句型。

I agree课堂 - SpeakingMax英语口语达人

Let me“ is a good pattern to use in a sentence when you're asking for permission.

当你在请求允许时，“Let me”句型是一个非常有用的句型。

Let me 课堂 - SpeakingMax英语口语达人

I like" is a useful pattern for firming that yes, you want to do something.

I like” 是一个很有用的句型，它可以用来强调你想要做的事情。

I like课堂 - SpeakingMax英语口语达人

So it's a useful way of not quite knowing in advance what you want to put in a string, but being able to create strings, phrases, sentences, dynamically.

这是一个很有用的方法，如果你之前不是很了解,在句子中要加入什么，但是这个方法可以,动态地创建字符串，短语，句子。

哈佛公开课 - 计算机科学课程节选

And when I'm starting to write lots of lines of code, you know, it's frankly kind of useful to be able to see more on the screen at once without having to scroll.

当我开始写很多行代码的时候，你们懂的，这明显是有用的，当你可以在屏幕上看到更多的代码,而不用滚动屏幕。

哈佛公开课 - 计算机科学课程节选

Now as an aside, turns out you can do more interesting formatting with printf, and this is useful even for ASCII art purposes.

说点题外话，结果你可以用printf来打印其他的格式,这是非常有用的,甚至是为了ASCII艺术的目的。

哈佛公开课 - 计算机科学课程节选

But when you start writing programs, especially when we get to web-based stuff where you want -- to check the user's input -- is it valid, is it an email address, -- and all these different scenarios -- it's actually often useful to be able to just enumerate them or rattle them off using this switching construct instead.

但是当你看是写程序时，特别是当我们,使用基于网络的东西，你想要,检查用户的输入-,它是合法的吗？它是不是一个电子邮箱地址？,所有的这些场景-,实际上它常常是有用的，当你用枚举结构列举它们,或者用它来快速地来说出它们。

哈佛公开课 - 计算机科学课程节选

So the pain you're suffering now is actually instrumentally valuable, useful as a means, even though it's intrinsically bad.

所以你现在忍受的痛苦,是有利用价值的，作为手段是有用的，尽管痛苦本身是坏的。

耶鲁公开课 - 死亡课程节选