translation.en: And during World War II, what he would see would be pilots coming back from their missions, and he noticed that within their eyes they had shards of small bits of material lodged within the eye, but the very interesting thing about it was that material, actually, wasn't causing any inflammatory response.
translation.zh: 在二战期间，他注意到 执行完任务回来的飞行员的眼睛里， 执行完任务回来的飞行员的眼睛里， 有一些细小的碎片藏在里面， 有一些细小的碎片藏在里面， 但比较有趣的是， 这些碎片材料 并没有引发任何炎症。