| 1. | Dust and dirt soon accumulate if a house is not cleaned regularly. |
| 房屋不经常打扫,尘土很快就越积越多。
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| 2. | If you don't sweep your room every day, dust will accumulate . |
| 如果你不每天打扫，房间里就会积满灰尘。
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| 3. | However, as the evidence began to accumulate , experts from the Zoo felt obliged to investigate, for the descriptions given by people who claimed to have seen the puma were extraordinarily similar. |
| 可是，随着证据越来越多，动物园的专家们感到有必要进行一番调查，因为凡是声称见到过美洲狮的人们所描述的情况竟是出奇地相似。
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| 4. | As they grow old, people also accumulate belongings for two other reasons, lack of physical and mental energy, both of which are essential in turning out and throwing away, and sentiment. |
| 人们年老之后也喜欢收藏东西，不过是出于两个不同的原因：一是体力，精力均告不佳，这二者是清除无用的东西必不可少的因素；另一原因是感情因素。
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| 5. | accumulate books, a library |
| 收藏书籍, 集成书库
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