20-05-07 Have you ever seen a hive of bees? Some hives are made with glass sides, through which we can see all that the bees are doing. 你有没有看到过蜂箱? 有些蜂箱的侧面是玻璃的, 你可以透过它们看到里面蜜蜂的活动情况。 In early summer each perfect hive conta...