It is so hard to believe because it is so hard to obey.
Behavior is determined by the current stimulus situation and past reinforcement history.
船总是被称为“她”,因为保养一艘船需要花费大量油漆和装饰。
闪电使各国合为一体。
中年之后,只有已为告别人生做好准备的人,才能继续在生活中朝气蓬勃。
【释义】沉着、细致、思想力、独立性——内向者这四种特质恰是未来核心竞争力。
Some people are busy dying, others are busy living.