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...
预防犯罪的官员可以登门拜访并就如何使居所更安全向你提出建议。Crime Prevention Officers can visit your home and suggest ways to make it safer.他们不仅丢掉了工作，还失去了居所、自尊乃至生存的理由。They have lost not only their jobs, but their homes, their self-respect and even th...