It was impossible for him to shut his eyes to it, and having seen it he could but strive, at any cost, to prevent it.

他不可能对它视而不见， 既然看到了它， 他只能不惜一切代价努力阻止它。

To exaggerate even more, we could say that Plato turned his back on the sensory world and shut his eyes to everything we see around us.

更夸张地说， 我们可以说柏拉图背弃了感官世界， 对我们周围看到的一切闭上了眼睛。