I carefully observe the swallows 'nests and discover that they are rectangular lodges made out of bits of mud. The nests are shaped like the long underground tunnels of moles I used to see out in the country. They look very sturdy.
我仔細的看那燕窩，發現燕窩是泥塑的長形居所，它隆起的形狀，很像舊時鄉居土的地穴，看起來是相當牢靠的。