Behavior is determined by the current stimulus situation and past reinforcement history.
唯一真正安全的系统是关闭的,浇筑在混凝土块中,并密封在有武装警卫的铅衬房间中——即便如此,我仍有疑虑。
The ocean is not just a resource to be exploited, but a legacy to be preserved for future generations.