So, as long as this valuable harvest is properly controlled, 所以 只要这种利润可观的 采摘行为得到适当控制
As soon as its nest is removed a bird will immediately build another. 燕窝被摘去后 金丝燕很快又会再吐一个
becomes a clear and obvious target and is asking for trouble. 立刻成为显眼的目标 很快便遭了殃
In the absence of plants this food chain is based on a continuous supply of bat droppings. 在缺少植物的情况下 这里的食物链 完全依赖供应不断的蝙蝠粪便
This hundred metre high mound is made entirely of bat droppings - 这堆100多米高的东西 全都是蝙蝠的排泄物
Its surface is covered by a thick carpet of cockroaches, 地面上爬满了密密麻麻的蟑螂
This is the biggest underground river passage in the world, 这是世界上最大的地下河通道
Limestone is composed of minerals derived from marine shells and corals, 石灰岩由海螺和 珊瑚中的矿物沉积后形成
so although this rocky escarpment in the United States is now hundreds of metres above sea level 所以 尽管美国境内的这座石壁 如今矗立在海平面以上几百米高的地方