Cliff swallows construct ovenlike nests, also out of mud but with a small round entrancehole.
崖燕也以泥巴筑巢，只是筑成的巢像烤箱，只留一个小圆。
2
Cable entrance cover plate: interchanged and removed easily, convenient to open cable entrancehole and conducting cable.
可相互替换，移动方便，易于开孔进线和电缆导入。
3
Ideally, the site will be a cavity in a tree, well off the ground, with a small entrancehole facing south, and lots of room inside for brood and honey.