Ancient humans even made rudimentary drills to smooth out the rough holes left behind and beeswax to plug cavities, like modern-day fillings.

人类已用磨尖的燧石去除烂牙古代人甚至做出了简易的牙钻用来磨平粗糙的蛀孔。

When they feel the cold weather coming, each snail finds some quiet place, where it makes a smooth hole in the earth to live in.

如果感觉到寒冬就要来临, 每只蜗牛都会寻找到一个安静的地方, 在那里为自己造出一个光滑的小洞准备住下。