In the Oval Office, Prime Minister Harper said he does not worry that the Taliban could form an alternative government in Afghanistan, but that he is concerned about the Afghan government's ability to maintain security.

VOA: standard.2009.09.16

So, these are all involved with our ability to maintain homeostasis by exchanging materials with the external environment.

这个过程关乎人体维持内稳态的能力,内稳态通过与外环境进行物质交换来实现

耶鲁公开课 - 生物医学工程探索课程节选