translation.en: 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.
translation.zh: ，你就产生了 这一类收缩和怪异的呼啸声。 所有的这些都表明， 真笑是极易被识别的， 或者说极易被感受到的。