The need is a kind of inherent state of the lifeorganism.
需要是生命有机体的一种内在固有状态。
2
Lifeorganism of the human body is the basic teaching content in medical education, which must always be followed when we make and develop courseware.
医学教育是以人体的生命机制为基本教学内容，在制作和开发多媒体课件的过程中应时时遵守这一准则。
3
If conditions within an organism's environment occasionally or regularly become harsh, it may be advantageous for an organism to have a resistant stage built into the life cycle.