3. 眼角沒有皺紋的笑容可能是假笑

If someone's trying to look happy but really isn't, you won't see the wrinkles.
如果有人試圖表現(xiàn)出開心的樣子，但并不是發(fā)自內心的高興，那么你是看不見對方的笑紋的。

More recently, a study from Northeastern University researchers found that people could do a pretty good job of faking a Duchenne smile, even when they weren't feeling especially happy.
最近，美國東北大學的一項研究發(fā)現(xiàn)，人們即使并沒有感到特別開心，也能偽裝出完美的假笑。

It seems safe to say that if the crinkles aren't there, the person's probably not genuinely happy. But just because the crinkles are there doesn't necessarily mean they're elated.
所以比較保險的說法是，沒有皺紋的笑容證明一個人可能不是真正的快樂。但僅僅因為笑出皺紋，也不能確定一個人真的很開心。