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1·The landlord had let the building fall into decay.

房东不管，房子已经破烂不堪。《牛津词典》

2·Old civilization may fall into decay.

古老的文化可能会渐渐衰落下去。

3·The old civilization may fall into decay.

古代的文化可能衰落。

4·The old civilization may fall into decay .

古代的文化可能衰落。

5·The buildings had started to fall into decay.

这些建筑物开始衰败。

6·Recognizing the dual nature of opium in particular their medicinal value and the special nature of addiction will help us understand why the opium trade has enabled China to fall into decay.

认识鸦片的双重属性，特别是因其药用价值和使人上瘾的特殊性，将有助于我们理解鸦片贸易曾使中国近代走向衰弱的原因。

7·That fall into the cave happened 1.977 million years ago, according to dating based on the rate of decay of uranium in the rock layer that holds the fossils.

根据保存这些化石的岩石层里铀衰变率的基础上所确定的年代，那次掉入洞穴事件发生在197.7万年前。

8·It tells the history of the decline and fall into social and moral decay of one of the Southern aristocratic family, the Compsons, in which his writing techniques come to perfection.

作者通过康普生家族的故事为我们描绘了一幅美国南部贵族阶级的衰落图景。

衰败

1·The buildings had started to fall into decay.

这些建筑物开始衰败。