内在动机和外在动机的区别在于，内在动机是来自内部的，外在动机是来自外部的。
The difference between the two is that intrinsic motivation is internal, while extrinsic motivation is external.
在心理学中，所谓的内在动机是指因为自然而然地认为做某件事是有益的而采取行动。
Intrinsic motivation, as it's known in psychology, is doing something because that activity is inherently rewarding.
生存是所有生物物种固有的内在动机，人类也不例外。
The motivation for survival is inherent within every biological species.
应用推荐