不同的环境会给你不同的刺激，这些会让你产生不同的想法，采取不同的行动。
The different contexts will give you different stimulus, which will trigger off different thoughts and actions in you.
一是外部原因即动机，动机是对意志的刺激，使意志产生行动的需要。
The one is motivation, a external reason. Motivation is a stimulus to will, which lets will emerge activity require.
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