This means that hypotheses about violent behaviour which could not be tested experimentally for practical or ethical reasons, can now be examined in a scientific way.

• 这就意味着：从前人们由于实际操作不便或是伦理道德的原因不能通过实验测试到而只能通过假定来判断的暴力事件现在可以用一种科学的方式得到检测了。