A forty-foot-high concrete wall encircles the jail.监狱周围有一圈40英尺高的混凝土墙。The concrete will stay as solid as a rock.混凝土会像岩石一样坚固。These targets consist of three mock airstrips and two concrete pads.这些目标分别由三条模拟机场跑道和两个水泥平台组成.It w...
Litter breakdown or fragmentation is due to the litter fauna.落叶层粉碎的原因在于落叶层的动物相.A vacant lot or a bombsite can, to the amateur naturalist, produce an extraordinary variety of flora and fauna.对于业余博物学者来说，在一片空地上或被炸后的废墟里可能发现种...