translation.en: And he thought to himself, "They go from one density of medium, the air, into another density of medium, water, without a splash. Look at this picture.
translation.zh: 让他灵光一闪，“他们从一种密度的介质，空气 进入另一种密度的介质，水 却溅不起一丝水花。”看看这张照片