Also, you start to get these sort of contractions and weird whistling sounds, all of which mean that real laughter is extremely easy, or feels extremely easy to spot. In contrast, posed laughter, we might think it sounds a bit fake.
또 수축현상이 생기며 이상한 휘파람 소리가 나는데 모두 진짜 웃음을 매우 쉽게 구별하게 합니다. 반대로 억지웃음은 좀 꾸민 것처럼 느끼죠.