Logical empiricist discuss this problem on the basis of rationality but they think that rationality may boil down to modal and truth may be equal to reason they make truth become the shadow of a shade .

逻辑经验主义（包括波普尔）主要在理性的基础上讨论科学进步问题，他们把理性形式化，把真理等同为理由，从而使真理成为 虚幻。

He stopped to rest refuge in the shadow of the donkey and a shade to avoid exposure .

他停下来休息，躲避在驴子 的 影子 下，求 个 荫凉，暴晒。