So let's start off looking at something rather not-so-small, something that we can see with our naked eye, and that's a bee. So when you look at this bee, it's about this size here, it's about a centimeter.
我们先从那些还不算太小的 肉眼就能观察到的东西开始吧 这是一只蜜蜂 你看它 大概是这样的大小 大约一厘米