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我们如何知道何时投资升级？
How do we know when to invest in an upgrade?
youdao
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科学家是如何知道的呢？
How do scientists know?
youdao
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那么我们如何知道哪些光谱模式与哪些元素相匹配呢？
So how do we know which spectral patterns match up with which elements?
youdao
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我的意思是，研究人员如何知道大象或黑猩猩是否认识自己？
I mean, how do researchers know if elephants or chimps recognize themselves?
youdao
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首先我们如何知道作者在那儿，其次，我们是否应该诉诸作者的权威。
It's a question rather of how we know the author to be there firstly, and secondly, whether or not we should appeal to the authority of an author.
youdao
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每一集都将聚焦于一个不同的科学领域，告诉我们，我们知道什么，我们是如何知道的，以及我们仍然不知道什么。
Each episode will focus on a different area of science and tell us what we know, how we know it, and what we still don't know.
youdao
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那么应用程序如何知道您何时在线？
How then does the application know when you're online?
youdao
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参与者如何知道工作何时开始？
How do participants know when to start?
youdao
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你如何知道你的生活何时达到和谐？
How do you know when your life is in balance?
youdao
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我战战兢兢问她如何知道号码的。
Trembling, I asked how she knew about the Numbers.
youdao
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我们如何知道何时已经完成了？
How do we know when we're done?
youdao
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如何知道这种信息是实现细节。
How it knows this is an implementation detail.
youdao
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你如何知道你什么时候成功的？
How will you know when you're successful?
youdao
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那么您如何知道应该显示哪个专辑呢？
So how will you know which albums to show?
youdao
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但是如何知道服务器是否正在运行呢？
But how do you know that the server is running?
youdao
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您如何知道哪些元素检出了？
How do you know which elements you have checked out?
youdao
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但是当最后时刻到来时您又如何知道呢？
But how do you know when that moment has arrived?
youdao
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我如何知道椅子是存在的？
How do I know that there are chairs?
youdao
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个人如何知道在特定的环境中怎么做了？
How does one know what to do in a particular circumstance?
youdao
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您如何知道他们是否称职？
How do you know they're qualified for the job?
youdao
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我如何知道我应当使用这些工件的哪一个？
How do I know which one of these artifacts I should use?
youdao
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关键问题是，他们如何知道自己要去哪里？
A key question is how they know where they are going.
youdao
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我们如何知道客户机何时完成消息发送呢？
How do we know when the client is finished sending the message?
youdao
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您如何知道多少才够呢？
How do you know how much is enough?
youdao
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例如，翻译人员如何知道哪个元素需要翻译？
For example, how does the translator know which elements to translate?
youdao
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如何知道您需要哪一个修复程序？
How do you know which fix you need?
youdao
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但是我们如何知道？
But how do we know?
youdao
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如何知道自己忧郁呢？
How do you know if you have the blues?
youdao
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如何知道自己忧郁呢？
How do you know if you have the blues?
youdao