A self-fulfilling prophecy is a prediction that directly or indirectly causes itself to become true. 

“自我实现预言”指的是直接或间接导致预言本身实现的一种预测。

In other words, a positive or negative prophecy, strongly held belief, or delusion -- declared as truth when it is actually false -- may sufficiently influence people so that their reactions ultimately fulfill the once-false prophecy. 

换句话说，积极的或者消极的预言，强烈坚持的信念，或者错觉（被宣称是真实的，其实是错误的），都可能足以影响到人们，使人们的反应最终会导致先前错误的预言实现。