translation.en: There was a very important study done a while ago at Princeton Theological Seminary that speaks to why it is that when all of us have so many opportunities to help, we do sometimes, and we don't other times.
translation.zh: 不久前有一项非常重要的研究 在普林斯顿神学院展开，解释了为什么 在我们有如此多的机会可以去助人的情况下 我们却时而帮忙，有时不会