n.海鸟粪（用作肥料）
The cave floor is covered in guano. 洞穴地底覆盖了满满的鸟粪。
The canyon walls are lined with giant nests and guano. 峡谷壁上到处是巨大的鸟身人巢穴和鸟粪。
Guano means droppings from seabirds which are used as a sort of fertilizer. 鸟粪层就是海鸟的粪便，可以用作肥料。
n.禽龙
