This is an informal expression that can be used in any situation and everybody in America will understand you.
这是一个非正式的短语，可以用在所有的情形当中，在美国的人都会明白你的意思的。
This is also probably the first time that your supervisor has seen the formal expression of concepts that may have been approved previously in an informal manner.
这也许是第一次你的导师看到关于这些概念的正式表达，这些理论以前也许用非正式的形式证实过。
We wanted an expression that was playful and informal.
我们需要一种好玩的，非正式的表现。
This is a happy expression, and you can use it in any situation — formal an informal — and everybody will understand what you mean.
这真是一个带有幸福感的表达，可以在任何场合使用正式场合啊、非正式场合都可以——大家都能明白你的意思。
This is a happy expression, and you can use it in any situation — formal an informal — and everybody will understand what you mean.
这真是一个带有幸福感的表达，可以在任何场合使用正式场合啊、非正式场合都可以——大家都能明白你的意思。
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