translation.en: And so you see here some early studies of blocks, where those holes are actually coming through, and this is before the thermo-bimetal is applied, and this is after the bimetal is applied. Sorry, it's a little hard to see, but on the surfaces, you can see these red arrows.
translation.zh: 你可以看到在早期对多层建筑的研究中发现 这些孔实际上让空气进入的地方 这是在使用热双金属之前 这是在使用热双金属之后 抱歉 这个有点难看明白 不过在表面上你可以看见红色的箭头