15年前，当我们开始运作盖茨基金会（Gates Foundation）时，我们认为所有显而易见的步骤都已经在进行了，我们所要做的是追寻高成本或尚未得到证明的解决方案。
When we started the Gates Foundation 15 years ago, we assumed that all of the obvious steps were already being taken, and that we would have to go after the expensive or unproven solutions.