He made every effort to smooth out his habitual worried look and wear a sunny smile, since a happy expression can lead to genuinely happy feelings.
他努力消除他惯常的忧虑神情，脸上挂着灿烂的笑容，因为快乐的表情会带来真正快乐的感觉。
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。
When I was with you, your words, a facial expression and even a smile will make me happy a whole day.
而与你在一起时，你的一句话、一个表情、一个笑容，都将使我高兴一整天。
The author adds that these 'leaks' can be seen in a person displaying conflicting emotions, like a happy tone of voice paired with an angry facial expression.
作者补充说，如果一个人表达的情感产生了冲突——比如语调是欢快的，但同时呈现的面部表情却是愤怒的——最容易被人抓住撒谎的漏洞。
The results showed that: (1) when displays contained the same faces, children were slower in detecting the absence of a discrepant face when the faces displayed angry rather than happy expression.
结果发现：(1)当呈现相同表情时，对愤怒表情的图片的觉察比对愉快表情的图片的觉察要慢。
In their view, this is the most intuitive expression when a person feels happy and satisfied.
在他们看来，这是一个人感到幸福、满足的最直观表现。
In their view, this is the most intuitive expression when a person feels happy and satisfied.
在他们看来，这是一个人感到幸福、满足的最直观表现。
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