translation.en: To investigate this question, we ran an experiment where we had people watch a video of a father and his four year-old son, and his son has terminal brain cancer.
translation.zh: 为了探索这个问题，我们又进行了一个实验。 在这个试验中，我们让参与者看一个短片， 有关一位父亲和他四岁的儿子， 儿子身患致命的脑癌。