Making moral decisions is not easy, says Prof Gilkey. 吉尔基教授说，作道德决定并不是一件容易的事。
The work started more than three-and-a-half years ago, and Prof Gilkey spent the first two years developing the protocol and procedure for the experiment. 该实验始于三年半前，吉尔基教授将头两年用于制定实验的计划和步骤。
