意思是在manifest之前.
而manifest意思如下
1.readily perceived by the eye or the understanding; evident; obvious; apparent; plain:a manifesterror.
2.
Psychoanalysis .of or pertaining to conscious feelings,ideas,and impulses that contain repressedpsychic material:the manifest content of a dream as opposed to the latent content that it conceals.
如果是医学生物类的话,结合词义1的意思就是 在被证明之前,在证据显现之前,在能被肉眼观察到之前,在能被理解之前