justifiable
adj
that can be justified 可证明为正当的; 有理由的
a justifiable explanation, action, use 合理的解释、行为、 用法
justifiable homicide, eg killing in self-defence正当杀人(如出於自卫).
Most of us are able to solve most of our problems. Often, all we need is a good friend who will listen to us while we talk things through. If friends can take turns to listen to each other well, life will be better!